I am getting old. I no longer can sit all day playing games. 2 hours and I am like, that's it. I think it also depends on nature of game. Games that are challenging, I find it hard to play for long periods.
I got Dead space remake at launch, & only at chapter 4 (near end I think), & this is supposed to be a short game. But to be fair, like most survival game, I play like rogue games (one genre I hate most) that is if I play badly one session, I will reload until I get a good run (do not use excessive ammo & lose excessive health if at all). I also have the habit of running back to save points after any mob pack kills....which extends the game time.
I had bad experience playing RE and some other games in the past & being careless, end up out of health and ammo, making the game far harder then need to.
Which also explains why I dislike survival games in general. I do enjoy dead space though, but I am taking it very slow. Hopefully I can finish the game by march.