In total I had fifty rounds loaded. It took me about two hours to shoot them all at the range. So I would say maybe two minuets between shots. They where all five shot groups. So between each five I had to get out a new data sheet, fill in all the info and then start to shoot again, and right after each shot I would open gun to help it cool faster. I also had to stop alot since the guy shooting next to me did not grasp the concept that I had ten targets set up and he had one, so I had to stop alot so he could go set up new paper on the range. I always checked the barrel and would say it was just barely warm at most, it never got real warm, and has never been hot.