Dungeon time limits have to go

[MilesSaintboroguh]

This cannot be done. If there was no limit to the number of servers for each instance it could be but because there are simply limitations on how many they can have active at once allowing for people to stay in one for an unlimited amount of time is just not possible.

Nailed it there. There are only so many instances set up for dungeons and other quests, so you can't have people hogging all the instances. That's why there's a time limit.