If it helps any, I cleared every quest sans a few pain in the ass collections, and ran every non-horde instance at least once, and my twin druids have 6days, 12hours /played each at lv63.5, and that's with spending 30-60mins every night post-playing dancing in IF or Shatt before I log off. It simply comes down to knowing the game and using every quest at your disposal + rested exp built up during the day while yer at work ;p

Though to be fair, I had my 70 pretty much 1shotting things pre-30 and aoeing a bit, then all 3 dpsing post-30 to oneshot most other things.