Quote Originally Posted by Raype View Post
It uses an exp system.

You only get exp by carrying out actions.

20 hours is a rough estimation of player skills and modes used, objects hacked, vials located, sisters saved, victories, total kill count, times being/killing the big daddy, and methods of killing.

If you're idling, it'll probably take a couple hundred. And at least one person will have to keep playing the whole time.
Oh. How dare they not set it to something that's not easily rigged for someone who doesn't play multiplayer.