Hi @Jolagos,
Not sure why this topic is in the praise section… but anyways, FiveM (AFAIK) is not a registered game on Steam and I don’t think it will ever be due to the nature of it being a multiplayer modification rather than a standalone game.
With that being said, I used to also see my hours rack up until one day they stopped and now I can’t even see SDK Base. I would assume it’s most likely because it’s not registered on Steam and as a result - Steam is not bothering with tracking/displaying play time (I could be wrong of course, but this is just my wild guess).