>>11801364 (OP)A lot, if not most, titles back then were under an hour long because of cartridge space and hardware limitations in general, it's why they were often so much harder than nowadays, sending you back to the title screen and all, to make it last. It's one of the main reasons I stick more to retro though, sure it could take me a few hours to finish it, it's rare to beat something in a 1st run, however even if it takes me a few hours it's still less than current video games, also every time I have 30 minutes to spare and choose to sit down to play, I know that technically I can beat it, the goal is so close as soon as I press start on the title screen.
It might not be much, but as an adult with little spare time, it's helpful, especially for replays when you're already good at it.