Days Played stat on GB innaccurate count of MW2 time played

Anybody looked at their achievements on GiantBomb? If you look at mine, it says under "Days Played By Game" that I've played Modern Warfare 2 for 41 days. This number is horribly inaccurate. I've played roughly 7.5 days online multiplayer, probably around 24 hours of single player, and I think even less of Spec Ops.
 
So why does GB think I've been playing MW2 so much?

Yeah, I've noticed that too. It says I've played CoD4 for about 70 days or something like that, and last time I checked in the game, it was around 6-7 days.

I'm pretty sure it's counting days in relative term, say you played it everyday in a week that would count as 7 days. Mon, Tues, Thur only would count as 3 days.

Yeah I think it means the amount of days you've played on and not the amount of hours you've played converted into days.

Oh, that would make some sense. Thanks.