The first set of pads I installed without turning the brake rotors (they were in good shape with no significant grooving or runout) and they lasted 28k miles. The next set I installed with new rotors all around, the rear pads lasted 35k miles and the fronts are still on there with 54k miles on them. When I had the first set on the Montero, I was towing our tent trailer up to Northern AZ at least once a month to go camping - going back and forth from the 1200' elevation in Phoenix to roughly 7500' elevation in the mountains where we camped apparently wore the brakes out far quicker than the next set which hasn't experienced nearly as much towing.