Short games since I can play or alternate different games between. If too long, my attention goes elsewhere.

I do like longer games but I also like to have a palate cleanser game like a racing game or a death match type of game to play when I don't feel like playing the longer game. I also tend to have two games going like currently it's Horizon Zero Dawn on PS4 and Titan Quest Anniversary on PC. They are both long games but also easy to jump between when I get a bit tired of one of them.

But yes, Skyrim is at 550 hours, Oblivion at 300 hours, Fallout 3 at 250 hours, Fallout 4 at 280 hours, New Vegas 175 hours, Borderlands 2 at 150 hours etc. So I do like long games.

Yes.

I see you are a mathematician.

Actually, I would like some short games that have a bit of what you call "grinding" in them.

The biggest problem I have with some short games without any replay value is that I feel like the experience is over just when I mastered the controls.

I love long games, but only when they have a decent storyline. Not the most amazing/epic/original, just decent. Because at one point the brand new game with engaging gameplay, will lose some of it's luster, and a decent storyline is enough to get you through to the end.

For example, Druidstone is an amazing turn based tactics game, but the storyline is so bad it killed it for me. There is a reason writing school exists.