lol ... Since this is my first post in this thread I might as well and give it a try with serious ingridients ...
It depends a lot on the opponents and if the race is slowed down by long rain periods. With X2010 rain is not a problem for you but it will significantly slow down the AI drivers.
In 24h Le Mans You will have to do more than 320 laps for sure. I did about 350 and it took me good 16 hours of driving.
In 24h Nordschleife you will have to do more than 150 laps for sure. I did about 156 and it took me not full 13 hours of driving (what can I say - I just love the track).
Just beware of the night periods. It gets really really dark. I found myself letting off full throttle and braking into corners I know can be taken flat out. But the darkness changes everything for you ...
And for the love of god - please just try enough to at least give the topic a proper title with correct spelling ... (nüren hurts my eyes and my heart)