Be careful with saving during races.
This what just happened to me. I was like 50 minutes till the end of 9h at Tsukuba and saved the game. After resume car was going to fast so got out from the pit entry. I thought "ok one more lap and then I'll pit" but it turned out that I don't control the car. It's going around by itself - without any petrol and tyres (at v-max 79 km/h). Now with 28 minutes till the end I'm (or rather my car is) 8 laps ahead so it will be close, but probably not enough. If I loose 1st place then I'll turn off GT5 and try to load it once again.
I turned off GT5 started again and it was the same.
Looks it's known issue - http://community.eu.playstation.com/t5/Gran-Turismo/Tsukuba-save/td-p/13800747
Sadly I lost over 8h.
I always found Tsukuba pit lane weird, you have to get into the lane way to early. If you go too late, you just drive straight through.
Started the 9hr race last night, only 1/2 hr in. But I want it over, so using X1. Looks like after 6 hrs I should be up enough to let it sit for about 3 hours.
When I was doing the 24h of Le Mans the first time around, I had a running calculation going in Wolfram Alpha that told me how much more time I had to race before I can park and leave it running to win.
I think it was
(Total Time)-(Number of Laps Ahead of 2nd place)*(Time elapsed)/(Number of Laps completed)-(Time elapsed)
I'm pretty sure that was the formula I used...
This is what i need, but don't you need to know the AI laptime? I'm doing 3:30's, no idea what they're doing.