Valve Releases Team Fortress 2 Gameplay Data
Some standout observations: tc_hydro features the longest games by far, averaging nearly 95 minutes (this seems like it could be inaccurate), but 20% of all time is spent on cp_gravelpit; close combat weapons, particularly the bonesaw, achieve critical hits most often; the rocket launcher deals nearly a quarter of all damage done; the engineer has the longest average lifespan; and the scout is far and away the leader in captures.
From The Chatty
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I really don't believe that 95 minutes figure for hydro. Maybe the servers I frequent are all just configured in a specific way but I definitely know I haven't played any hour and half games of ANY map.