Final Fantasy: Apotheosis, with my original gaming group from back in high school, finished Session 14 two weeks ago. Final Fantasy: Revelations, a game with my girlfriend and one of my best friends, is on Session 4 tomorrow. Both are slated to go about 30-35, I think -- any longer and I think the game will lose something.
I ran around a 25-session World of Darkness game a long time ago. One problem we've had is that we're so much better with a game with a definite beginning and end than forever-continuing games. We've had a number of 3-to-5-session games. The FF games will be the long ones for me, 60-70 total, most likely. I expect to finish them over the next two years (weekly meetings, but with a player in law school, always subject to change).
My mind is blown by 400-500-session games. How do you REMEMBER all that stuff?