diff --git a/app/Console/Commands/AutoSaveExp.php b/app/Console/Commands/AutoSaveExp.php
index 6e02380..fca5cc9 100644
--- a/app/Console/Commands/AutoSaveExp.php
+++ b/app/Console/Commands/AutoSaveExp.php
@@ -293,13 +293,23 @@ class AutoSaveExp extends Command
         if ($openLog) {
             DB::table('position_duty_logs')
                 ->where('id', $openLog->id)
-                ->update(['duration_seconds' => DB::raw('GREATEST(0, TIMESTAMPDIFF(SECOND, login_at, NOW()))')]);
+                ->update([
+                    'duration_seconds' => DB::raw('GREATEST(0, TIMESTAMPDIFF(SECOND, login_at, NOW()))'),
+                    'updated_at' => now(),
+                ]);
 
             return;
         }
 
-        // ② 今日无开放日志 → 新建（login_at 优先用今日进房时间，跨天则用 now()）
-        $loginAt = ($user->in_time && $user->in_time->isToday())
+        // ② 今日无开放日志 → 新建
+        // 若今日已有已关闭的日志（是重建场景），必须用 now()，防止重用旧 in_time 累积膨胀
+        $hasClosedToday = PositionDutyLog::query()
+            ->where('user_id', $user->id)
+            ->whereDate('login_at', today())
+            ->whereNotNull('logout_at')
+            ->exists();
+
+        $loginAt = (! $hasClosedToday && $user->in_time && $user->in_time->isToday())
             ? $user->in_time
             : now();
 
diff --git a/app/Http/Controllers/ChatController.php b/app/Http/Controllers/ChatController.php
index 2469ae9..3f5c84d 100644
--- a/app/Http/Controllers/ChatController.php
+++ b/app/Http/Controllers/ChatController.php
@@ -1065,15 +1065,27 @@ class ChatController extends Controller
         if ($openLog) {
             DB::table('position_duty_logs')
                 ->where('id', $openLog->id)
-                ->update(['duration_seconds' => DB::raw('GREATEST(0, TIMESTAMPDIFF(SECOND, login_at, NOW()))')]);
+                ->update([
+                    'duration_seconds' => DB::raw('GREATEST(0, TIMESTAMPDIFF(SECOND, login_at, NOW()))'),
+                    // DB::table raw update 不自动刷 updated_at，必须手动设置，
+                    // 否则 CloseStaleDutyLogs 会误判此 session 为掉线而提前关闭。
+                    'updated_at' => now(),
+                ]);
 
             return;
         }
 
-        // ② 今日是否已有任意日志（含已关闭的）？
-        // 若有：说明用户本次是重新进房，已经有历史记录，直接新建本次进房的日志段
-        // 若无：说明今天第一次进房，新建，login_at 优先用 in_time
-        $loginAt = ($user->in_time && $user->in_time->isToday())
+        // ② 若今日已有「已关闭」的日志段，说明是 CloseStaleDutyLogs 关闭后重建：
+        //    必须用 now() 作为 login_at，防止重用旧的 in_time（如今日 00:00）导致
+        //    每次重建的 duration_seconds 都从午夜算起，累加成等差数列（产生 249h 等异常值）。
+        //    只有今日首次创建（无任何历史日志段）时，才用 in_time 保留真实进房时刻。
+        $hasClosedToday = PositionDutyLog::query()
+            ->where('user_id', $user->id)
+            ->whereDate('login_at', today())
+            ->whereNotNull('logout_at')
+            ->exists();
+
+        $loginAt = (! $hasClosedToday && $user->in_time && $user->in_time->isToday())
             ? $user->in_time
             : now();
 
diff --git a/resources/views/admin/appointments/duty-logs.blade.php b/resources/views/admin/appointments/duty-logs.blade.php
index 3bf6b21..8ba2648 100644
--- a/resources/views/admin/appointments/duty-logs.blade.php
+++ b/resources/views/admin/appointments/duty-logs.blade.php
@@ -32,7 +32,7 @@
             <div class="text-2xl font-bold text-green-600">
                 {{ gmdate('H', $logs->sum('duration_seconds')) }}h {{ gmdate('i', $logs->sum('duration_seconds')) }}m
             </div>
-            <div class="text-xs text-gray-500 mt-1">累计在线时长（当前页）</div>
+            <div class="text-xs text-gray-500 mt-1">累计在线时长（所有）</div>
         </div>
         <div class="bg-white rounded-xl p-5 border shadow-sm text-center">
             <div class="text-2xl font-bold text-orange-600">{{ $userPosition->total_rewarded_coins }}</div>