i got 46.
the criteria I used (which i won’t hold anyone else to, use your own criteria) was whether I played it for more than 2 hours (steam’s cutoff for returns, or at least it was as of the last time i returned a steam game). like I’ve technically played tekken and thps, but only when visiting other people’s houses as a kid, so can I really say I played them? at the same time there are games like yakuza 0 where I never got around to beating it because life stuff came up and I lost interest by the time i got free time again, but I put in like 30 hours so should I say I never played it?
Six, but Minecraft, Factorio and Dwarf Fortress have been keeping me going for at least the last 10 years, and I've played other games not on this (somewhat skewed) list.