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I think with stock pads and tires the car doesn't need more cooling for 20-25 minute sessions. I think 30 minute sessions are marginal, and anything non stock probably needs cooling.
However, I think there may be a misconception that the hoses will significantly reduce peak rotor temps under threshold braking. In reality, brakes need the straights with lots of air to cool down before the next braking zone. I would think these ducts help lower the steady state temps, which would mean either longer sessions or using higher friction pads.
FWIW, pretty much all race cars get their rotors glowing under threshold braking conditions, even with optimal cooling.
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