diff --git a/src/components/StatusBar.vue b/src/components/StatusBar.vue
index 8e515351..6822e3c2 100644
--- a/src/components/StatusBar.vue
+++ b/src/components/StatusBar.vue
@@ -1,6 +1,7 @@
 <template>
     <div
-        class="shrink-0 h-[22px] flex items-center bg-sidebar border-t border-border font-mono text-xs select-none overflow-hidden"
+        class="shrink-0 h-[22px] flex items-center bg-sidebar border-t border-border text-xs select-none overflow-hidden"
+        style="font-family: var(--font-mono-cjk)"
         @contextmenu.prevent>
         <ContextMenu>
             <ContextMenuTrigger as-child>
@@ -50,19 +51,53 @@
                             </div>
                         </TooltipWrapper>
 
-                        <TooltipWrapper
-                            v-if="!isMacOS && visibility.vrchat"
-                            :content="
-                                gameStore.isGameRunning ? t('status_bar.game_running') : t('status_bar.game_stopped')
-                            "
-                            side="top">
-                            <div class="flex items-center gap-1 px-2 h-[22px] whitespace-nowrap border-r border-border">
-                                <span
-                                    class="inline-block size-2 rounded-full shrink-0"
-                                    :class="gameStore.isGameRunning ? 'bg-status-online' : 'bg-status-offline-alt'" />
-                                <span class="text-foreground text-[11px]">{{ t('status_bar.game') }}</span>
-                            </div>
-                        </TooltipWrapper>
+                        <HoverCard v-if="!isMacOS && visibility.vrchat" v-model:open="gameHoverOpen" :open-delay="50" :close-delay="50">
+                            <HoverCardTrigger as-child>
+                                <div class="flex items-center gap-1 px-2 h-[22px] whitespace-nowrap border-r border-border">
+                                    <span
+                                        class="inline-block size-2 rounded-full shrink-0"
+                                        :class="gameStore.isGameRunning ? 'bg-status-online' : 'bg-status-offline-alt'" />
+                                    <span class="text-foreground text-[11px]">{{ t('status_bar.game') }}</span>
+                                    <span v-if="gameStore.isGameRunning" class="text-[10px] text-foreground">{{
+                                        gameSessionText
+                                    }}</span>
+                                </div>
+                            </HoverCardTrigger>
+                            <HoverCardContent
+                                v-if="gameStore.isGameRunning && userStore.currentUser.$online_for"
+                                class="w-auto min-w-[160px] px-3 py-2"
+                                side="top"
+                                align="start"
+                                :side-offset="4">
+                                <div class="flex flex-col gap-1">
+                                    <div class="flex items-center justify-between gap-3">
+                                        <span class="text-[11px] text-muted-foreground">{{ t('status_bar.game_started_at') }}</span>
+                                        <span class="text-[11px] text-foreground">{{ gameStartedAtText }}</span>
+                                    </div>
+                                    <div class="flex items-center justify-between gap-3">
+                                        <span class="text-[11px] text-muted-foreground">{{ t('status_bar.game_session_duration') }}</span>
+                                        <span class="text-[11px] text-foreground">{{ gameSessionDetailText }}</span>
+                                    </div>
+                                </div>
+                            </HoverCardContent>
+                            <HoverCardContent
+                                v-else-if="!gameStore.isGameRunning && gameStore.lastSessionDurationMs > 0"
+                                class="w-auto min-w-[160px] px-3 py-2"
+                                side="top"
+                                align="start"
+                                :side-offset="4">
+                                <div class="flex flex-col gap-1">
+                                    <div class="flex items-center justify-between gap-3">
+                                        <span class="text-[11px] text-muted-foreground">{{ t('status_bar.game_last_session') }}</span>
+                                        <span class="text-[11px] text-foreground">{{ lastSessionText }}</span>
+                                    </div>
+                                    <div class="flex items-center justify-between gap-3">
+                                        <span class="text-[11px] text-muted-foreground">{{ t('status_bar.game_last_offline') }}</span>
+                                        <span class="text-[11px] text-foreground">{{ lastOfflineTimeText }}</span>
+                                    </div>
+                                </div>
+                            </HoverCardContent>
+                        </HoverCard>
 
                         <HoverCard v-if="visibility.servers" v-model:open="serversHoverOpen">
                             <HoverCardTrigger as-child>
@@ -284,8 +319,9 @@
         NumberFieldIncrement,
         NumberFieldInput
     } from '@/components/ui/number-field';
-    import { useGameStore, useGeneralSettingsStore, useVrcStatusStore, useVrcxStore } from '@/stores';
+    import { useGameStore, useGeneralSettingsStore, useUserStore, useVrcStatusStore, useVrcxStore } from '@/stores';
     import { HoverCard, HoverCardContent, HoverCardTrigger } from '@/components/ui/hover-card';
+    import { timeToText } from '@/shared/utils';
     import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
     import { useIntervalFn, useNow } from '@vueuse/core';
     import { TooltipWrapper } from '@/components/ui/tooltip';
@@ -315,10 +351,41 @@
     const isMacOS = computed(() => navigator.platform.includes('Mac'));
 
     const gameStore = useGameStore();
+    const userStore = useUserStore();
     const vrcxStore = useVrcxStore();
     const vrcStatusStore = useVrcStatusStore();
     const generalSettingsStore = useGeneralSettingsStore();
 
+    // --- Game session timer ---
+    const gameHoverOpen = ref(false);
+
+    const gameSessionText = computed(() => {
+        if (!gameStore.isGameRunning || !userStore.currentUser.$online_for) return '';
+        const elapsed = now.value - userStore.currentUser.$online_for;
+        return elapsed > 0 ? timeToText(elapsed) : '';
+    });
+
+    const gameStartedAtText = computed(() => {
+        if (!userStore.currentUser.$online_for) return '-';
+        return dayjs(userStore.currentUser.$online_for).format('MM/DD HH:mm');
+    });
+
+    const gameSessionDetailText = computed(() => {
+        if (!gameStore.isGameRunning || !userStore.currentUser.$online_for) return '-';
+        const elapsed = now.value - userStore.currentUser.$online_for;
+        return elapsed > 0 ? timeToText(elapsed, true) : '-';
+    });
+
+    const lastSessionText = computed(() => {
+        if (gameStore.lastSessionDurationMs <= 0) return '-';
+        return timeToText(gameStore.lastSessionDurationMs);
+    });
+
+    const lastOfflineTimeText = computed(() => {
+        if (gameStore.lastOfflineAt <= 0) return '-';
+        return dayjs(gameStore.lastOfflineAt).format('MM/DD HH:mm');
+    });
+
     // --- Servers status HoverCard ---
     const serversHoverOpen = ref(false);
     let serversHoverTimer = null;
diff --git a/src/components/__tests__/StatusBar.test.js b/src/components/__tests__/StatusBar.test.js
index 9eaf8f16..c1b0c06f 100644
--- a/src/components/__tests__/StatusBar.test.js
+++ b/src/components/__tests__/StatusBar.test.js
@@ -189,6 +189,8 @@ function mountStatusBar(storeOverrides = {}) {
                         Game: {
                             isGameRunning: false,
                             isSteamVRRunning: false,
+                            lastSessionDurationMs: 0,
+                            lastOfflineAt: 0,
                             ...storeOverrides.Game
                         },
                         Vrcx: {
@@ -202,6 +204,12 @@ function mountStatusBar(storeOverrides = {}) {
                             lastStatusSummary: '',
                             ...storeOverrides.VrcStatus
                         },
+                        User: {
+                            currentUser: {
+                                $online_for: Date.now()
+                            },
+                            ...storeOverrides.User
+                        },
                         GeneralSettings: {
                             ...storeOverrides.GeneralSettings
                         }
@@ -269,4 +277,17 @@ describe('StatusBar.vue - Servers indicator', () => {
         const wrapper = mountStatusBar({ Game: { isSteamVRRunning: true } });
         expect(wrapper.text()).toContain('SteamVR');
     });
+
+    test('shows last game session details when game is offline and there is session data', () => {
+        const wrapper = mountStatusBar({
+            Game: {
+                isGameRunning: false,
+                lastSessionDurationMs: 3_600_000,
+                lastOfflineAt: new Date('2026-03-13T14:30:00Z').getTime()
+            }
+        });
+
+        expect(wrapper.text()).toContain('Last Session');
+        expect(wrapper.text()).toContain('Offline Since');
+    });
 });
diff --git a/src/coordinators/__tests__/gameCoordinator.test.js b/src/coordinators/__tests__/gameCoordinator.test.js
new file mode 100644
index 00000000..42793e4a
--- /dev/null
+++ b/src/coordinators/__tests__/gameCoordinator.test.js
@@ -0,0 +1,165 @@
+import { beforeEach, describe, expect, test, vi } from 'vitest';
+
+const mocks = vi.hoisted(() => ({
+    userStore: {
+        currentUser: {
+            $online_for: 1000,
+            currentAvatar: 'avtr_test'
+        },
+        markCurrentUserGameStarted: vi.fn(),
+        markCurrentUserGameStopped: vi.fn()
+    },
+    gameStore: {
+        isGameNoVR: false,
+        setLastSession: vi.fn(),
+        setIsGameRunning: vi.fn(),
+        isGameRunning: false,
+        setIsSteamVRRunning: vi.fn(),
+        isSteamVRRunning: false
+    },
+    instanceStore: {
+        removeAllQueuedInstances: vi.fn()
+    },
+    updateLoopStore: {
+        setIpcTimeout: vi.fn(),
+        setNextDiscordUpdate: vi.fn()
+    },
+    gameLogStore: {
+        clearNowPlaying: vi.fn()
+    },
+    vrStore: {
+        updateVRLastLocation: vi.fn(),
+        updateOpenVR: vi.fn()
+    },
+    advancedSettingsStore: {
+        autoSweepVRChatCache: false,
+        relaunchVRChatAfterCrash: false,
+        gameLogDisabled: false
+    },
+    configRepository: {
+        setBool: vi.fn().mockResolvedValue(undefined),
+        setString: vi.fn().mockResolvedValue(undefined)
+    },
+    addAvatarWearTime: vi.fn(),
+    runLastLocationResetFlow: vi.fn()
+}));
+
+vi.mock('vue-sonner', () => ({
+    toast: vi.fn()
+}));
+
+vi.mock('../../shared/utils', () => ({
+    deleteVRChatCache: vi.fn(),
+    isRealInstance: vi.fn(() => false)
+}));
+
+vi.mock('../../services/database', () => ({
+    database: new Proxy(
+        {},
+        {
+            get: (_target, prop) => {
+                if (prop === '__esModule') return false;
+                return vi.fn().mockResolvedValue(null);
+            }
+        }
+    )
+}));
+
+vi.mock('../../stores/settings/advanced', () => ({
+    useAdvancedSettingsStore: () => mocks.advancedSettingsStore
+}));
+
+vi.mock('../../stores/avatar', () => ({
+    useAvatarStore: () => ({})
+}));
+
+vi.mock('../avatarCoordinator', () => ({
+    addAvatarWearTime: (...args) => mocks.addAvatarWearTime(...args)
+}));
+
+vi.mock('../../stores/gameLog', () => ({
+    useGameLogStore: () => mocks.gameLogStore
+}));
+
+vi.mock('../../stores/game', () => ({
+    useGameStore: () => mocks.gameStore
+}));
+
+vi.mock('../../stores/instance', () => ({
+    useInstanceStore: () => mocks.instanceStore
+}));
+
+vi.mock('../../stores/launch', () => ({
+    useLaunchStore: () => ({})
+}));
+
+vi.mock('../../stores/location', () => ({
+    useLocationStore: () => ({ lastLocation: { location: '', playerList: { size: 0 } } })
+}));
+
+vi.mock('../locationCoordinator', () => ({
+    runLastLocationResetFlow: (...args) => mocks.runLastLocationResetFlow(...args)
+}));
+
+vi.mock('../../stores/modal', () => ({
+    useModalStore: () => ({})
+}));
+
+vi.mock('../../stores/notification', () => ({
+    useNotificationStore: () => ({ queueGameLogNoty: vi.fn() })
+}));
+
+vi.mock('../../stores/updateLoop', () => ({
+    useUpdateLoopStore: () => mocks.updateLoopStore
+}));
+
+vi.mock('../../stores/user', () => ({
+    useUserStore: () => mocks.userStore
+}));
+
+vi.mock('../../stores/vr', () => ({
+    useVrStore: () => mocks.vrStore
+}));
+
+vi.mock('../../stores/world', () => ({
+    useWorldStore: () => ({ updateVRChatWorldCache: vi.fn() })
+}));
+
+vi.mock('../../services/config', () => ({
+    default: mocks.configRepository
+}));
+
+vi.mock('worker-timers', () => ({
+    setTimeout: vi.fn()
+}));
+
+import { runGameRunningChangedFlow } from '../gameCoordinator';
+
+describe('runGameRunningChangedFlow', () => {
+    beforeEach(() => {
+        vi.clearAllMocks();
+        mocks.userStore.currentUser.$online_for = 1000;
+        mocks.gameStore.isGameNoVR = false;
+    });
+
+    test('persists and stores last game session when game stops', async () => {
+        vi.spyOn(Date, 'now').mockReturnValue(5000);
+
+        await runGameRunningChangedFlow(false);
+
+        expect(mocks.gameStore.setLastSession).toHaveBeenCalledWith(4000, 5000);
+        expect(mocks.configRepository.setString).toHaveBeenCalledWith('VRCX_lastGameSessionMs', '4000');
+        expect(mocks.configRepository.setString).toHaveBeenCalledWith('VRCX_lastGameOfflineAt', '5000');
+        expect(mocks.userStore.markCurrentUserGameStopped).toHaveBeenCalled();
+    });
+
+    test('skips persisting last game session when no valid session start exists', async () => {
+        mocks.userStore.currentUser.$online_for = 0;
+
+        await runGameRunningChangedFlow(false);
+
+        expect(mocks.gameStore.setLastSession).not.toHaveBeenCalled();
+        expect(mocks.configRepository.setString).not.toHaveBeenCalledWith('VRCX_lastGameSessionMs', expect.any(String));
+        expect(mocks.configRepository.setString).not.toHaveBeenCalledWith('VRCX_lastGameOfflineAt', expect.any(String));
+    });
+});
diff --git a/src/coordinators/gameCoordinator.js b/src/coordinators/gameCoordinator.js
index 3ac52880..d626d71d 100644
--- a/src/coordinators/gameCoordinator.js
+++ b/src/coordinators/gameCoordinator.js
@@ -41,6 +41,18 @@ export async function runGameRunningChangedFlow(isGameRunning) {
         userStore.markCurrentUserGameStarted();
     } else {
         await configRepository.setBool('isGameNoVR', gameStore.isGameNoVR);
+        // persist last session data before markCurrentUserGameStopped resets $online_for
+        const sessionStart = userStore.currentUser.$online_for;
+        const offlineAt = Date.now();
+        if (sessionStart && sessionStart > 0) {
+            const sessionDuration = offlineAt - sessionStart;
+            // set store state synchronously so UI reads it immediately
+            gameStore.setLastSession(sessionDuration, offlineAt);
+            await Promise.all([
+                configRepository.setString('VRCX_lastGameSessionMs', String(sessionDuration)),
+                configRepository.setString('VRCX_lastGameOfflineAt', String(offlineAt))
+            ]);
+        }
         userStore.markCurrentUserGameStopped();
         instanceStore.removeAllQueuedInstances();
         runAutoVRChatCacheManagementFlow();
diff --git a/src/localization/en.json b/src/localization/en.json
index 718565af..afe7fbd6 100644
--- a/src/localization/en.json
+++ b/src/localization/en.json
@@ -2719,6 +2719,10 @@
         "game": "Game",
         "game_running": "VRChat is running",
         "game_stopped": "VRChat is not running",
+        "game_started_at": "Started",
+        "game_session_duration": "Duration",
+        "game_last_session": "Last Session",
+        "game_last_offline": "Offline Since",
         "servers": "Servers",
         "servers_ok": "VRChat servers are operational",
         "servers_issue": "VRChat Server Issues",
diff --git a/src/stores/__tests__/game.test.js b/src/stores/__tests__/game.test.js
new file mode 100644
index 00000000..bb7cc1e8
--- /dev/null
+++ b/src/stores/__tests__/game.test.js
@@ -0,0 +1,51 @@
+import { beforeEach, describe, expect, test, vi } from 'vitest';
+import { createPinia, setActivePinia } from 'pinia';
+
+vi.mock('../../services/config.js', () => ({
+    default: {
+        getBool: vi.fn(),
+        getString: vi.fn()
+    }
+}));
+
+import configRepository from '../../services/config.js';
+import { useGameStore } from '../game';
+
+function flushPromises() {
+    return new Promise((resolve) => setTimeout(resolve, 0));
+}
+
+describe('useGameStore', () => {
+    beforeEach(() => {
+        setActivePinia(createPinia());
+        vi.clearAllMocks();
+        configRepository.getBool.mockResolvedValue(true);
+        configRepository.getString.mockImplementation((key, defaultValue) => {
+            if (key === 'VRCX_lastGameSessionMs') {
+                return Promise.resolve('7200000');
+            }
+            if (key === 'VRCX_lastGameOfflineAt') {
+                return Promise.resolve('1700000000000');
+            }
+            return Promise.resolve(defaultValue ?? null);
+        });
+    });
+
+    test('loads persisted last session data during init', async () => {
+        const store = useGameStore();
+        await flushPromises();
+
+        expect(store.isGameNoVR).toBe(true);
+        expect(store.lastSessionDurationMs).toBe(7200000);
+        expect(store.lastOfflineAt).toBe(1700000000000);
+    });
+
+    test('setLastSession updates session values', () => {
+        const store = useGameStore();
+
+        store.setLastSession(15000, 25000);
+
+        expect(store.lastSessionDurationMs).toBe(15000);
+        expect(store.lastOfflineAt).toBe(25000);
+    });
+});
diff --git a/src/stores/game.js b/src/stores/game.js
index d7120863..510ad2be 100644
--- a/src/stores/game.js
+++ b/src/stores/game.js
@@ -22,11 +22,21 @@ export const useGameStore = defineStore('Game', () => {
 
     const isHmdAfk = ref(false);
 
+    const lastSessionDurationMs = ref(0);
+
+    const lastOfflineAt = ref(0);
+
     /**
      *
      */
     async function init() {
         isGameNoVR.value = await configRepository.getBool('isGameNoVR');
+        const [savedMs, savedAt] = await Promise.all([
+            configRepository.getString('VRCX_lastGameSessionMs', null),
+            configRepository.getString('VRCX_lastGameOfflineAt', null)
+        ]);
+        if (savedMs) lastSessionDurationMs.value = Number(savedMs) || 0;
+        if (savedAt) lastOfflineAt.value = Number(savedAt) || 0;
     }
 
     init();
@@ -59,6 +69,15 @@ export const useGameStore = defineStore('Game', () => {
         isHmdAfk.value = value;
     }
 
+    /**
+     * @param {number} durationMs Session duration in milliseconds.
+     * @param {number} offlineTimestamp Timestamp when game stopped.
+     */
+    function setLastSession(durationMs, offlineTimestamp) {
+        lastSessionDurationMs.value = durationMs;
+        lastOfflineAt.value = offlineTimestamp;
+    }
+
     /**
      * @param {Date | null} value Last crashed time.
      */
@@ -99,11 +118,14 @@ export const useGameStore = defineStore('Game', () => {
         isGameNoVR,
         isSteamVRRunning,
         isHmdAfk,
+        lastSessionDurationMs,
+        lastOfflineAt,
 
         setIsGameRunning,
         setIsGameNoVR,
         setIsSteamVRRunning,
         setIsHmdAfk,
+        setLastSession,
         setLastCrashedTime,
         getVRChatCacheSize,
         getVRChatRegistryKey
diff --git a/src/styles/fonts.css b/src/styles/fonts.css
index ddbb2f25..321c733d 100644
--- a/src/styles/fonts.css
+++ b/src/styles/fonts.css
@@ -26,6 +26,10 @@
     --font-primary-cjk:
         var(--font-cjk-jp-primary), var(--font-cjk-sc-primary),
         var(--font-cjk-kr-primary), var(--font-cjk-tc-primary);
+    --font-mono-cjk:
+        ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
+        'Liberation Mono', 'Courier New',
+        var(--font-primary-cjk), monospace;
 }
 
 :root[lang='zh-CN'] {