Can't remember, it was 5 years ago. I would guess about 200 miles. Not sure it helped,but the bronze gear had some deep grooves worn in it when i removed it. Gear on billet cam is pretty hard(heat treated i'm sure). I am still running that cam. Let the bronze gear take the abuse for as long as you can without it completely failing of course.
When i install a new gear i check the backlash with a dial indicator and write it down. That way you will have a measurement to compare to as it starts wearing. Save time, i hate pulling the distributor, especially mine with the intake in the way.
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Ray
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