Originally Posted by sailor

Lots of people are finishing it, myself included, but thats because I was playing it seven hours a day for the past few days. Id say there is around 20 hours of gameplay (and damn good gameplay at that)--not real long, but not short by any means. And its certainly the best game Ive ever played.

Spoiler: My favorite parts were the under the bridge section and the whole citadel level, especially the "train" ride.