The race is already long and its pointless to race 1 hour. And i think there is really no need safety car. Btw the period between rounds could be shorter.
If i'm right, the lap record on CTRA was about 1.18.10, but it could be done by bump drafting maybe. Anyway, it's all about a good setup and driver's skills. I did my lap fair without any bump drafting. My spb is 1.18.33 but i was bored to do better