Heh. It's a small piece of the whole pie, actually.

5420 games of Halo 3
7205 games of Reach (but really, only 5239 if you leave out Campaign and Firefight)

It feels like I play a lot... but the numbers suggest differently. (Total matchmaking time in Reach, which I played for 27 months, was 27 days - that's a day a month, or an average of an hour a day. Total matchmaking time in Halo 4, which I've played for 14 months, is 12.5 days... a more than 10% drop.)

I suppose the fact that I went through a major life change this year (a move across the country, coupled with a big change in workload) might account for that. :)