I have reached level 60 in Progress Quest. It's been a long slow grind, what with starting the game and then leaving it alone while I work. Sadly, I'll admit that after level 50 or so I started macroing (i.e., I put a shortcut to the game in my startup directory). According to the datestamp on pq.exe, I've been working on this character off and on since the beginning of July.
If I were playing World of Warcraft for 8 hours a day, it would take me slightly more than two months to reach level 60, which is the highest level in the game.