Sounds like you should give it a break if you're doing it to the point of loss of concentration.

Could you keep it down to once a day, or maybe twice? What's spurring the arousal? Do you look at porn? Avoid some things that spur you on.

Dude I use to beat it up 5, 6, even 8 times a day. This went on for a little while, I'm 38 now and I'm fine..... I just love women that's all....... Hell the wind blew wrong and I was pulling it out. So have at junior!!

5 times in a day is pretty normal if you've got nothing else going on and you can't get sex off your brain. Doing that every day is a little hard on your body, likely where your exhaustion and loss of concentration comes form. Make sure you're eating enough protein and sugars to sustain that level of intense activity. Also if this is the daily routine for you you might be concerned about whether you're following the natural urges of your body or just chasing a pleasure high from the orgasm. If here's a history of addiction in your family you may want to check in with a health professional about your masturbation.