Penumbra: Requiem - How long?

[Zeewolf]

According to the game, 3 hours and 30 minutes. But I assume it didn't count the stuff I had to replay when I died, so it was probably around 4 hours in total. Not bad, really.

Edit: Except for the one time I had to ask for help here, I did it all on my own. Quite pleased with that.