Endurance time of day speed?

Ghiaman1334

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Hi there,
So I'm arranging my own offline endurance and GT leagues. For these leagues I want to include endurance races. 6, 12, 24 hour stuff. Obviously, though, I don't want to actually sit with my laptop for 24 hours driving.
My question, then, is how high do I set the time multiplier if I only want to be racing for, say, half an hour to a full hour of real time? What does everyone else do? Also can races be set to not be lap-based but time-based?
 
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