I read that the two energy recovery devices were the same as the Le Mans configuration, but they ignored the regulation that requires a limit of 2L/lap of fuel. I bet they could do a 3 hour race, not sure about 24 hour.
Thanks.
tells all the changes they made to the car
What Makes Porsche’s 1160hp F1-Beating LMP1 Car So Fast?
https://www.youtube.com/watch?v=vGYjrbZ9hqs