Gaming giants Microsoft have announced that their most popular franchise, Halo has sold over 60 million copies worldwide since 2001. They’ve also announced that over 6 billion hours have been spent on the games, which equates to 684,000 years.

Leading franchises such as Nintendo’s Mario and Pokemon, EA Sports’ Need for Speed and FIFA have sold much more with over 100 million copies under their belt, but the Halo franchise has never been cross-platform, or available for a portable device, which further shows how impressive the 60 million feat really is.

This number should only increase in the near future with the Halo: The Master Chief Collection – Xbox One bundle and the release of Halo 5: Guardians in 2015.