Well - I am hard hard on my brakes - third set of pads @ 40,000 miles. During an autocross day - I'll do 8 runs at are about 3mins each, hit about 65-75 top speed, on the brakes hard, 20 times a run.
When the car is stopped at the end, smoke coming from each wheel, the smell of burnt brake pads and the rims are so hot you can feel it walking by them.
the way you can tell if the pads are over heating is that they begin to fade - meaning they do not stop as well - they start falling off slowly, then, very much. On the stock pads by the end of my 8th run I would almost run over the flag man as the brakes were gone. Once cooled off - everything was back to normal.