Well, you will stop being so horny for a little while and you will be very sleepy. And you will wonder where the day went.
You mean, he needs to find a new hobby. He obviously has a hobby.
Eventually you won't be able to keep your stamina during actual intercourse. Try and get outside and do something. Masturbating is normal but when it is ALL you are doing ALL day long, that's when you need to distract yourself and find a hobby