which was the longest game you played that is not an RPG or multiplayer?

[osed125]

Call me crazy, but my game is VVVVVV. It takes a lot of time to get more than 2 minutes on the super gravitron and beat the game in less than 18 minutes. I think I have spent 70 hours perfecting that game.

I regret nothing!

Edit: the runner up would be F-Zero GX. It's probably a lot more than VVVVVV but I can check the time on that game.