probably more to do with time management and making life easier for the race director as different classes would complete those laps in different times. For example
40 Laps in Mod Touring car would be much quicker than 40 laps VTA so VTA would end up with more "track time" and what about the newb that takes 15mins to finish 40 laps, do you wait for everyone to finish??
I do think we should be taking advantage of LiPo and long run times. 15 minute mains would be sweet
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