It takes a bit longer than that the first time through. Though I heard it's the second time that really kills you. Literally. Supposed to be impossibly hard.
love the game, took me over 10 hrs or so to beat the game. Died a lot at when i got to the space alien part. Game is well done, but i wish the story was a bit deeper, game supported 480p, had online, was dual-layer, longer, and supported co-op.
though i make it sound bad, i actually love the game so much that i colored the cover and made the blood on the chainsaw look better: