Heh... right there with you on that one. Between 400+ hrs on Xbox, more than double that on PC, and probably even more in the Construction Kit editor, TES3 swallowed a sizable chunk of my life. Skyrim, Kerbal Space Program, and Terraria also have embarrassingly high triple-digit totals...
my disc melted inside my xbox after playing for three days straight but on it i had about 6000 hours as of 2010, then i tried to recover everything on my pc and play some mods and got about 4k in when one of the house builder mods erased everything a few months ago. i wasted more then a year on the game lol
With all the statistic resetting and now statistics being shared per world instead of per minecraft, it would be difficult to check it for minecraft though.
Not really active time spent playing... but my "Accounts been logged in" time for Final Fantasy 11 was around 1200 DAYS :3