It looks like Korean players have beaten Diablo III’s single player mode, on normal difficulty, in around 4 to 5 hours.
Diablo III contains 4 acts and there is an achievement available that is earned by completing each act in under an hour. So it’s not an impossible task.
An image of the final part of the game has also made its way online. Do not click on this link if you want to avoid any spoilers.
Diablo III didn’t have the smoothest of launches with Error 37 being the bane of many who couldn’t connect to the game’s authentication servers.