It took me a bit over 14 hours to go through it and I did most of the sidemissions and I played very stealthily, but you can beat the game in around 6 hours from what I've heard, maybe even less if you know the shortest paths around the levels. But don't worry about the length, it didn't feel short at all and it still has tons of replay value if you're going for all the achievements (don't kill anyone through out the game etc.) and such.
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