(not gonna requote you, since it's been done 100 times already)deathzero021 said:bulls***
Picture someone devoted enough to do a huge gaming binge, for the first few weeks (game first came out shortly before Christmas, so people had time off from school). It would be easy enough for that person to rack up a good chunk of those 700 hours in a short time like that.
Let's assume that this person then becomes active in the modding community and thus stays interested in the game.
Then consider that we might be talking about a child/teenager that doesn't have a summer job and thus has an awful amount of spare time, during his off-school season.
It's not a huge stretch for me. It's not that hard to rack up 100 hours in a month (3-4 hours a day, spread evenly) and that's assuming that someone would consistently play the game like that for 7 months. And like you said, it's been 12 months, so he didn't even had to play the game that intensely.