Penumbra: Requiem - How long?

[wrath]

Just finished it. 3 hours+-20min of game time (i guess it was like 4-4.30 in real time). But i only found 4/9 artifacts (wasn't looking for them much anyway)
And since it reminds of Portal i must add that i finished Portal faster

I finished Requiem in 4hours. Good game, bit of a mindfuck ^_^.

Portal is a much shorter game. It seems to be roughly 2hrs for a first time playthrough, give or take 1/2hr depending on how quickly you wrap your head around portals, how focused you are on completing the puzzles, and your previous experience with mouse/keyboard and games. I can now beat it in about an hour, or less, but that's 'cause I'm nuts.