Down at C.O.B.R.A in wales we already run 6 min heats and finals without a problem,but as said earlier it more comes down to how much time in the day u have.i no the nitros run 10/15 etc etc finals but not heats they have about 2min warm up time on the track nd 5 min qualy. But if u banged in the heats then mby u could look at increasing the qualy timebut again u will have sum one colain sayin I dnt have time to do bla bla bla for a xample.
Just my 2p
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