So far, I've rolled 2 teams of 4 from 1-60 mostly by completing quests. Both teams got some help in the form of a 70 Hunter or 65 Pally "Carebear" and some BoE quest turnin prep. My first team (Shamans) took ~ 2 days 8 hours, and at least 3-4 hours were spent on totem quests. The second group (Priests) hit 60 in ~1 day 15 hours. I'd probably add a few hours to each team to account for my AH time as well.