If I had to play one game for 24 hours it’d either be a decent racing game or a fresh Pokémon run. Was tempted by Animal Crossing but there’s not much to do overnight on that.
Skyrim is a very good shout as well, I’ve put 120 hours into the Switch version alone. Still start a fresh play-through every now and then as well. Keep meaning to do an enchanted enhanced sword and shield one, as its one of the few play styles I’ve not actually done yet
One of the mods I loved was the random start mod. Basically instead of starting off as a prisoner you were thrown into the world at a random spawn point (there was something like 60-80 different ones), meant every start always felt different.
Man I might load it back up this weekend with a fresh playthrough haha.