What game, board, card, or console/pc have you sunk the most time in? [View all]

I think I can very strongly say that the game I have sunk the most hours into is Chess. I spent years playing, hundreds, if not thousands of people, I cannot even begin to estimate just how much time I have sunk into the game, but I played about 5 games a day from sixth grade into my mid 20's. At college I played chess numerous times a day, probably around the 20 mark....

As far as card games go, I have put the most time into Magic the Gathering.

PC gaming: Solitaire

Console: Diablo I

I was thinking about this subject this past Saturday as I was trying to figure out how much time I've put into Skyrim, and my wife asked me what video game I put the most time into, and I stated Diablo, but then we were discussing which game, of all genres/types I sunk the most time into, and Chess won hands down.