I have been boxing since August and I have several teams none of which have reached 30 yet... partly due to 2 boxing, then 3 boxing then 5 boxing and abandoning teams along the way (revisiting my 3x shaman and adding another 2) and partly due to having limited play time.

That said multi-boxing is certainly my bread and butter fun in wow. Yeah getting to 70 will be great but I am enjoying seeing all the content I missed along the way with my solo chars.