Falcon 4 I have thousands of hours in. I think the other games I have the most time in are...

Team Fortress 2 - 1600+ hours
Team Fortress Quake (original and TFC) - probably thousands
StarCraft 1 - Thousands (world champion titles require dedication)
Supreme Commander - Who knows?

Elite Dangers - 500ish?

Outside of of video games and computers:

Martial Arts - thousands of hours

There's a theme here, if you haven't discovered, already: I enjoy outwitting other humans.