I have played on average 15 maps a day of tact (75 rounds), 5 days a week, for the past 6 years (since GT1).
75 x 5 x 52 x 6 = 117,000 rounds of Gore
(I know I haven't been playing much at all lately, but this is just an average over 6 years. Id say in the early years I played this game 3 hours a night every single day.)