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The rotors will get rougher and rougher and tear up pads quicker as you pile on the track days so it will depend on how quickly you get tired of chewing up pads. At 30 track days, my rotors were about 60% worn (based on thickness of rotor measurements) however I was chewing up pads every 4-5 track days instead of 8-10 days. I believe I did 4 sets of pads before I hit my wallet pain threshold (from buying brake pads) and bought new rotors.
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