Sorry that you had a bad experience, but honestly it's the nature of the beast. Using DF will put you in these situations, especially in Aurum Vale. You almost need a bard, or hard hitting AOE to beat the last boss because of how the adds work. The timer is actually about 30 minutes longer than a person needs to do a clean run, as stated before it helps with server loads as well. The best advice I can give you is to find a premade, or just reque for the dungeon.
