diff --git a/Assets/Scripts/EC_GameRun.cs b/Assets/Scripts/EC_GameRun.cs
index 226ecd3065..aff54b0491 100644
--- a/Assets/Scripts/EC_GameRun.cs
+++ b/Assets/Scripts/EC_GameRun.cs
@@ -1243,6 +1243,8 @@ public partial class CECGameRun : ITickable
 	   //  g_TickMemoryHistory();
     // #endif
 
+	    TickHealthPlaytimeChatReminder(dwDeltaTime);
+
 	    return true;
     }
 
diff --git a/Assets/Scripts/EC_GameRunChat.cs b/Assets/Scripts/EC_GameRunChat.cs
index b8fb48f602..eec1fa7fe5 100644
--- a/Assets/Scripts/EC_GameRunChat.cs
+++ b/Assets/Scripts/EC_GameRunChat.cs
@@ -93,4 +93,36 @@ partial class CECGameRun
             }
         }
     }
+
+    /// <summary>
+    /// Seconds between chat reminders (default 10). Change at runtime or in code as needed.
+    /// </summary>
+    public float healthPlaytimeChatReminderIntervalSeconds = 600f;
+
+    private uint _healthPlaytimeChatReminderAccumMs;
+
+    private const string HealthPlaytimeChatReminderText =
+        "Chơi game quá 180 phút có hại cho sức khoẻ";
+
+    private void TickHealthPlaytimeChatReminder(uint dwDeltaMs)
+    {
+        if (GetGameState() != (int)GameState.GS_GAME)
+        {
+            _healthPlaytimeChatReminderAccumMs = 0;
+            return;
+        }
+
+        float intervalSec = Mathf.Max(0.1f, healthPlaytimeChatReminderIntervalSeconds);
+        uint intervalMs = (uint)(intervalSec * 1000f);
+        if (intervalMs < 1)
+            intervalMs = 1;
+
+        _healthPlaytimeChatReminderAccumMs += dwDeltaMs;
+        while (_healthPlaytimeChatReminderAccumMs >= intervalMs)
+        {
+            _healthPlaytimeChatReminderAccumMs -= intervalMs;
+            string redMsg = "<color=#FF0000>" + HealthPlaytimeChatReminderText + "</color>";
+            EventBus.Publish(new GameSession.ChatMessageEvent(redMsg, (byte)ChatChannel.GP_CHAT_SYSTEM));
+        }
+    }
 }