From 3/07/12 - Nearly 6 Million Years of World of Warcraft Healthy for Players' Brains

By one analyst's calculation, the 11 million or so registered users of the online role-playing fantasy World of Warcraft collectively have spent as much time playing the game since its introduction in 2004 as humanity spent evolving as a species-about 50 billion hours of game time, which adds up to about 5.9 million years.

http://kotaku.com/5891421/nearly-6-million-years-of-world-of...