I went in at 70 with a tank with 8k hp and shaman with 400 spell dmg, so UK was pretty painful and all I did was the first boss a few times. At 73 now I'm mostly out of quests, other than a few here and there and a bunch of collection quests I don't feel like doing. Although I'm spending 12-15 hours at each level due to a lot of world pvp, bg's, explopring, etc... I'm figuring it to be a good 8-10 hours of pure questing/instance grinding... I just don't get how you guys are so fast