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I agree/disagree here with the 15 min format.
15 is great to break the groups up to have less people riding, but somehow when I am watching other groups I still see the ill fated scenario - you see a few riders zoom past on the straights ... then nothing ... still some nothing ... oh hey look its the cluster fuck! What is also worse was the Monday sessions last time out with TTD and the one guy that got overly excited on pit out that he dumped it at T1 at Thompson forcing everyone else, literally everyone else, to sit in line while they pick up his bike.
I do like the 20 mins session purely on the fact you get more track time, and given if it red flags you still can salvage it. Although I never find myself running the WHOLE 20 mins, it's still good to have in place in case other issues come up.