"It is quite long - you can actually get up to level 30 in this game. It's still pretty easy, though."
I havent really read any spoilers yet, I did hear on the xbox version of a cheat/exploit in some caves of constantly spawning somesuch beast that allowed you to reach a level 40 cap.
I havent heard if they intend to fix that for the PC version.
Scorpio Slasher: ... What about you boy, what do hate?
Marcus: ... Bullies. Tiny d*ck egotists who hurt people for no reason, make people lock their doors at night. People who make general existence worse, people like you.