34 Hours

That's how long it's taken Talaesin to get to level 41. That's about 50 minutes per level... probably less, actually, if you exclude time on taxis, time spent AFK or in the auction house, and so on. Including things like alt-tabbing into a browser to write a quick blog post about how quickly you're leveling.

All in all, it's probably more like 40 minutes of playing time per level.

Wheh.