Got 2 warlock from 1 to 60 in about 2 days and 5 hours /played.

Can totally get to 60 in less than 2 days, those two were my very first multi-boxed chars and I spent a lot of time slacking in town/tweaking dual-box stuff.
The RAF bonus is totally awesome as you can really pick-up whatever quest you fell like doing, and get your level done in 6-7 quests.