From 6/10,000 miles. I get new pads ever time i get new tires. I changed them out at 8,000
on the V* 1100 and about 15,000 on my V* 650.
Dan, what you are saying is more than likely a ballpark average for most folks, some less than you get, a tiny few will get much more. The bottom line is how aggressive does a person ride,and is there a lot of stop and go in cities and towns. I am nowhere near a set of brakes yet with much over double where you change yours at. That's just the difference in different riders. Have fun, Dan, Ride safe!