Also bear in mind that game companies often exaggerate how long their products will last to help justify the product's cost. It also doesn't hurt that, as a game that charges a monthly fee, throwing this kind of number around might give investors that a 5 hour/week gamer would be paying to play the game for an entire year.

Also, with the heavier PVP focus, one wonders what portion of that time is presumed to be spent ganking and fighting off gank attempts.