Penumbra: Requiem - How long?

[Penumbra]

i think i was about 8 hours, maily cause i was chucking tomato sauce around for a goddamn hour. the lag didnt help either.
(new question for people.)

HOw many of you did it without using youtube, walkthroughs or cheat guides? lol

It took me about 3 hours to complete it.

I didn't use any helps at all, but I feel like I sorta cheeted, becuase on some of the puzzled I solved them in different ways than everyone else did. Like the box with the key in it on level 4 I think, when I picked it up, it just kinda exploded on its own. I didn't need to use the exploding katchup.