Using the raf tourguide addon found here on dual-boxing.com I was able to level 3 teams to 60 within the RAF time. The last team (5 pallys) took 2 days played (2 weeks real time) while only doing quests. Prior to this I've only ever leveled a single toon to 58. Once you level one team to 60, you get the hang of it and each team afterwards gets easier and faster.