I have found for the 24s that there's a valley of disinterest that happens between 9-11 hours into the race. I get the itch to quit, see if I can do better, get less rain, that kind of thing.I'm currently 9 hours into the 24h Le Mans endurance. While I'm having a good time, I don't think I'll be touching the Nurburgring 24h race unless they patch in B-spec. Hats off to you animals that have already finished all 50 PP races.
I'm currently at 11 hours into the same race as you. It started raining 4 hours in and didn't stop for 5 straight hours.
Once you cross the count DOWN time it gets a lot easier to push through. Right now you're at the hardest part to stay interested: The count up to 12 hours. Cross that threshold and it gets interesting again. Can I lap 1st one more time before the end? Can I get a fast lap as the sun rises.
Those are also things to look forward to. You started at 4pm local time, sun comes up about 6am local and you're about 5 hours from that. Then as the sun rises and the fog burns off the colors pop in a way you've not seen before.
Honestly even in a video game racing at sunrise after pounding through the darkness for 8 hours is a magical thing.