What's weird is while I don't claim to ever have done an endurance race, years ago I always played NR2003 full seasons at 100% race lengths, so some of the races (Martinsville/Bristol 500 laps) would go 5 hours, worse if there were a lot of cautions. I think the shortest race was maybe just under 3 hours. I imagine to NASCAR sim racers, 3 hours is nothing, and 5 hours is just a typical short track event.