Like Rusty Edge, I'm retired and so can play Civ4 as long as I want to. I have notes (some scanty, some very detailed) of over 30 games, of which the longest kept me happy for 160 hours and I know that several took over 100: I usually play Huge pangaea, normal speed, conquest or space. Add in a few shorter games, abandoned early as a sure loss, plus a few others when the game was new, and I feel certain I'm in the 4000+ class.