408 hours for me since steam started. But I also do a lot of testing and problem solving.
But I do have some maps made, so its not all work.
I would say normally in am in GG working on stuff for people, around 45 hours a week. Some classic projects that I am finishing up, also. Plus the model and scripting time is not on the books either.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit