[Feature request] time limit for each dungeon instances

I'd like to request time limit on each dungeon config file (Defaulted to 0 or unlimited). The reason I want this because:

• One of the player may be afk while playing dungeon. That means the dungeon instance will keep running indefinetely (or until daily restart). If that happens, there is a risk for that player being stuck while in dungeon, or inventory clear for afk'ed player(s) when the server restart.