If they were to come I’d expect them to bring along mid-race saves as well. I remember that wasn’t available in GT5 from the start but later patched in. Is there really any worry that that wouldn’t be included this time around? Feels like a given.
It's Polyphony. They removed the ability to
sell cars - a fundamental staple of the series and the genre. I wouldn't take anything for granted.
As far as lengths go, surely 24 hours can’t be “problematic” even with saves. They sort of serve as a driver change, albeit long ones. There were many variations of endurance races, 6 Hours of Tsukuba, 300 laps (?) of High Speed Ring and many others. 4 hours, 8, 12 and other lap variations.
Historically that's correct, but it's worth thinking from a gameplay perspective what you're trying to achieve with such long races.
It's not going to be a challenge of racecraft or strategy. Firstly because the GT7 AI isn't really up to supporting that. And secondly because the way GT7 rewards are structured means that the player is supposed to keep trying until they win, and very few people are going to be on-board for repeating a very long race. If it's not clear that they're gonna win in the first 30 minutes, they're gonna restart with a faster car.
So it's probably going to be pretty much purely a test of stamina, and I'd suggest that the feeling of reward from completing a 24 hour race isn't that much greater than the feeling from completing a shorter race. 6 hours is still crazy long. 3 or 4 hours is still
plan-your-day-around-this long. Even 2 hours is
maybe-have-a-wee-before-you-start long.
The risk you run the longer the races get is that people will simply be turned off just from the idea of it and will never even bother trying. And fair enough, I never did the 24 hour races in GT5 because I felt no need to put myself through that misery. They're not particularly fun to do, the "fun" comes afterwards in having conquered this mountain of mediocrity and I think that can be done just as well without the colossal waste of people's time.
A 24 hour race
could be done in a way that was interesting, strategic and engaging. But probably not in Gran Turismo. If we're talking about the style of long races that go into Gran Turismo games then yeah, I think the way that they're designed is a problem. They're by design only fun to the tiny portion of the player base that actually has nothing better to do with their life than grind out laps. And there's no sign in the other races in GT7 that Polyphony would deviate from their historical design principles at all.
The 24 hours races are a holdover from RPG design back when Gran Turismo was designed to borrow gameplay elements from RPGs. RPGs learned better ways of doing things, Gran Turismo can too.