Thank you for your question.
Excessive masturbation ( more than once or twice a day) is associated with several behavioural issues. It takes up a lot of time usually to the detriment of other gainful activities like studying or preparing for interviews or doing well on the job front. Once productivity goes down so does self esteem and self worth. This is then compounded by other addictive behaviours such as smoking, drinking, drugs or internet porn watching.
Here there are likely to be many deeper issues that need addressing. If you do not take care with correct guidance and counseling the masturbation will be replaced by other addictive behaviour. This person needs help from a professional- psychiatrist, psychologist or counselor who can help him overcome the reason he is masturbating so much.