Bungies latest update shows recent stats for halo 3. On saturday night a few lucky people got to play officially the billionth game played online on that game.
Here are some other stats (stats are accurate as of the Bungie update):
Even though it was released roughly three years earlier, Halo 2 only has 798 million games played.
If each game of Halo 3 lasted only three minutes and nineteen seconds, (mirroring the Infection game that was the 1 billionth game), the total amount of time played would eclipse sixty-three centuries. For those looking for more granularity, that's roughly 630 decades, 6,300 years, or 2,300,000 days.
As of the Bungie update, the exact total Halo 3 time played was 2,023,153,340,764 second. AKA two Trillion seconds, or 64,109 years of playtime.
These are pretty good stats shame i dont play the game no more though :(.