I recalled a few games doing a daily or a weekly server reboot. As long as you know when it's happening. Like an hour before or two hours before you should more than finish your dungeon. If you don't then that's your fault for trying to squeeze one last one in. But it would kick off a lot of the people whom afk since they're gone for most of the day anyways. The idea isn't bad and the fact that they haven't proceeded to do it is a bit disappointing.