How long can a male breed?

I was just wondering how long a male can breed. Ive been using my male for about 8 months now. Hes still going strong but I just wanted can he breed himself to death and will he start to shoot blanks after a while?

As long as you're giving him a few days' rest in between locks, he should be good.

They can breed all year around if you give them some time off every now and then. Just keep an eye on his weight and make sure he eats.