My average time to solo level a toon from 1-70 is 7-9 day's played, and that's skipping most group and all dungeons. That still leaves me with BEM, Netherstorm, SMV for Money quests.

On my first Team Pally, 4xShaman i'm at 6 days played and i'm almost 62. so i figure about 10-11 days played for the team which is a bit longer but i'll have 5 more 70s instead of one. only difference in the quests is i'm doing group/dungeon quests on my team and skipping the gathering ones, which is opposite of what i'd do solo leveling a toon.