another thought as well, it was said that the dungeons have quest "requisites", meaning the dungeons will be tied to a NPC quest-giver. The 5 minute timer will be nice for parties wiping, giving them time to collect and regroup and re-enter. If you actually complete the dungeon, you may at the same time complete the quest, and will thefore have to go pull a new repeatable quest to re-enter the dungeon again? No one has said if the NPC quest giver has a re-timer on them.