how long it takes to hit 60

[Donruss]

First character (no twink) Hardcore lvling prolly 3-4 months.

Casual who is also camping/questing gear, selling stuff in Ec, and doing other basic first character things, 10 months to a year prolly.

This is Assuming your play time is consistent, doesn't have to be a lot, but you can't take a month off either. Also, it is rare anyone gets to lvl60 without making an alt that they spend some time on.

For a solo class, skill wil be another factor. But casuals tend not to be the greatest solo'ers on the server.