Longer warning before system updates shut down game.

[Pandamoni]

I think it would be a good idea to give a 10 or 15 minute warning in AL if the system is going to shut down for updates. Some of the elite maps have bosses that take longer than 5 minutes to kill. It can be very frustrating if you are about to kill a boss or have spent 10 minutes in a dungeon to be dumped out before you have a chance to kill the boss.