The problem is watching them too much.
Some of guys thing that they are not guys enough if they don't jreak 10 times a day. I don't say it's not healthy to jreak off more than 2 times per a day, but doing it more than naturally what your body need is completely NOT HEALTHY !
Do it when you feel that you need it. Do that you feel your hormone level is high and you need to release it with pleasure. Don't go after pleasure because you can't go and grab it. Wait till it comes to you instead. That way you could jreak off and have the maximum pleasure.
How many times it's healthy to jreak off ?
Well it depends on your body and mind. Different to each other. But you could feel when your hormone level is right. Any adult male know what I'm talking about. When you honey , just do it. Don't try to overdoes it. Because it's your body and you should respect your body with respect.