diff --git a/kdb-bot/src/modules/achievements/achievement_attribute_resolver.py b/kdb-bot/src/modules/achievements/achievement_attribute_resolver.py
index 4badad37..f08f1579 100644
--- a/kdb-bot/src/modules/achievements/achievement_attribute_resolver.py
+++ b/kdb-bot/src/modules/achievements/achievement_attribute_resolver.py
@@ -44,3 +44,7 @@ class AchievementAttributeResolver:
     def get_played_on_game_server(self, user: User) -> List[str]:
         joins = self._user_joined_game_server.get_user_joined_game_servers_by_user_id(user.id)
         return joins.select(lambda x: x.game_server.name)
+
+    def get_last_ontime_hours(self, user: User) -> int:
+        ujvs = self._user_joined_voice_channels.get_user_joined_voice_channels_by_user_id(user.id)
+        return int(str(ujvs.max(lambda join: (join.leaved_on - join.joined_on).total_seconds() / 3600)))
diff --git a/kdb-bot/src/modules/achievements/achievement_service.py b/kdb-bot/src/modules/achievements/achievement_service.py
index 17486f80..b446d095 100644
--- a/kdb-bot/src/modules/achievements/achievement_service.py
+++ b/kdb-bot/src/modules/achievements/achievement_service.py
@@ -48,7 +48,9 @@ class AchievementService:
                 AchievementAttribute(
                     "played_on_game_server", lambda user: resolver.get_played_on_game_server(user), "GameServer"
                 ),
-                AchievementAttribute("last_single_ontime_hours", lambda user: user.level, "GameServer"),
+                AchievementAttribute(
+                    "last_single_ontime_hours", lambda user: resolver.get_last_ontime_hours(user), "number"
+                ),
             ]
         )
 
@@ -62,6 +64,9 @@ class AchievementService:
             "contains": lambda value, expected_value: expected_value in value,
         }
 
+    def add_achievement_attribute(self, atr: AchievementAttribute):
+        self._attributes.add(atr)
+
     def get_operators(self) -> list[str]:
         return [x for x in self._operators.keys()]