User blog comment:Joe Copp/Call of Duty played longer than humans have existed/@comment-5596583-20130815140308

It's not so bad as it looks. I ran calculation assuming that for every hour there has been since the realease of CoD4, 0.5% (500,000) of the CoD population according to this graph was playing. This totals out at 26.304 billion hours, which is close enough to the total up there.

Now, assuming said 500,000 people per hour switch out completely on the hour, every hour, 12,000,000 people would be playing daily. This averages out at 7.2 minutes per player, per day.

Not so bad, eh? (I can post my calculations if you want to check them)