how long it takes to hit 60

[Liav]

Massively exaggerated.

I managed to get a character from 1-42 (Barbarian Rogue, minor xp bonus) playing half assed hours and sometimes skipping days over the course of about 3 weeks to a month. You could probably do this in two weeks if you pull stupid long gaming sessions and don't play a hybrid.

Most of my friends that I leveled up with are already 53-54 due to my decreased play time and me having quit my Rogue to play a Monk.

TL;DR: You could do 1-60 in a month on a low XP penalty class. Maybe 2-3 months with an xp penalty and lower play time.