Halo 1: We had a LAN every weekend in a church, about 300 games.
Halo 2: Under 5k, I would have played way more but I didn't even have xbox live till containment release.
Halo 3: Almost 10k. At the time of i36 I quit playing and the game still lasted another half a year.
Reach: 259 games most of which were in the first couple of weeks, quit the game before there was any real competitive settings or maps.
Halo 4: About 20 games.
It is impossible to find exact numbers since back in H2 blockbuster gave me about 20 1 months and I had another full 12 month account and I forget its name.
Probably got about a year of WoW and 4300 LoL games which is almost 83 days playtime.
Massive nerd but I imagine I would be bored as fuck if I was to relive life without playing all those games.