Seems too often. 10 times a day must be consuming too much of your day. Isn't once or twice a day enough or are you obscessed. Suggest you seek counselling if you are over-addicted or just can;'t stop.
Seems excessive. Masturbation is not bad for you as the act itself. If you are preoccupied with masturbation and you cannot think of other things or do your work or job or if it interferes with your relationships or life in general, it is too much. It would sound as if you are preoccupied at this time and may have an anxiety or neurosis and your penis may suffer. Maybe you need to be seen by pcpmental health?