[Stunt]

Guess how many games of Halo 2 have been played since November 9th 2004. Go on. I dare you. If you said 324,362,454 then congratulations. You win a slightly baffled expression.
Now, remember that that's the number of games played. But a game can (and usually does) include more than one player, and you could absolutely argue that each player has a different experience. Can you guess how many “experiences” that amounts to? 2,189,713,986 when we last collected that data. Well over two billion. We're like McDonalds! Billions and billions served. Or owned, depending on your perspective.
How many unique players is that? Well, it's impossible to say – and I wish we could tell you how many Gamertags (and their guests) played it. Now that number is skewed a little, because it includes folks who renewed their Live account but chose a different name, it includes guests and it of course includes the two-month accounts. But it's still a lot of folks. And sadly, it's not our data to share. Its Xbox Live proprietary stuff. But it's a LOT! Probably more than you think.
Man-hours played in Matchmade games: 184,137,245. That means (in plain English) that the total number of hours spent playing Halo 2 by individual players is over 180 million. Naturally this time could have been spent say, cleaning, mowing the lawn, or building enormous stone monuments to my fantastic-ness. But it wasn't, it was spent playing Matchmade games. And just in case you're wondering, that is roughly 21,006 years. Way longer than human civilization has existed.
Personally speaking though, this is the most horrifying statistic: The Halo player who has played the most games to date (his identity will remain secret in order to protect his job) has played a staggering, mind-boggling 14,919 games, spending an average of six hours per day, and playing around 71 games. Per day. Now that guy is a freak. Seriously.