Bethesda has announced that Fallout Shelter, available on Android and iOS devices as well as PC and Xbox One, has reached the 100 million users milestone. You can check out other stats, below, but even if 100 million is impressive, looking at the stats it is clear that the average user isn't spending as much time as we have in the game. The average playtime is just under 4 hours, perhaps it's the nature of free-to-play, lots of people try it, but not that many get addicted. Either way, 100 million users is incredibly impressive.