You have to use dungeon finder to get back inside the dungeon efficiently and not manaul running. Que as tank on your warrior.
Also, the 2 hour quota would probably only work well with monks since they get 20% exp even at lvl 85+. I used this run on a monk which is why I said "2-3 hours" since it can vary. 85-90 are also pretty much the same exp to ding now 500k ish.