I can't say how much I've played in my whole lifetime, but I've played about 300 hours of Rainbow Six: Siege, 50 hours of The Escapists, 25 hours of Slime Rancher, 50 hours of Subnautica, and 100 hours of Game Dev Tycoon.
(All stats from Steam.)
xenonVirus. 300 hours sounds like a lot, but it probably isn't really that much compared to LP'ers, etc.