In DD or HoH, when the instance ends with a player that has DC'd the file is corrupted. At higher floors this is soul-wrenching for something no one can control. Now this is probably intended to prevent cheese but there are way fewer applications then there are times it can ruin a run. To fix this I think the timer after the boss for the instance should be extended past the 10m it currently is to an hour. This would make the maximum length of a HoH/DD reasonable in line with Eurekas, Diadems, Ultimates, and O4/8 but also give a much larger chance for DC'd players to come back in time before the game punishes them no apparent reason. I can't think how this would allow players to cheese the dungeon or boss itself with this change.