Take this with a grin of salt ( i tend to wander a bunch, and do non- leveling things like pvp). My 5 huntard team dinged 70 right at 14.5 days /played. Without all the messing around, and knowing now what I can/can't handle, like multiple instance runs where I wiped many many times over (just to complete the dang things), I'd say i could get the time down to about 9-10 days. Its what im working on with my new shaman team.