Just depends how much power you have and how hard you drive. A powerful 3200 lb car that is being driven hard on a road race course will cook the factory 11.75 rotors really quick. If you're just cruising around the track then they'll last a long time.

We use a custom built 13 x 1.250 rotor up front on this Valiant with Baer six piston calipers. Those are $3000 brakes and even those will start to fade after repeated stops from 150. Factory 11.75 rotors up front would be toast in a few laps on a car like this.