There is no definition of ‘normal frequency of masturbation’. Some people masturbate 2-3 times in a month and others masturbate 2-3 times in a day. The number and frequency of masturbations doesn’t matter until unless it starts disturbing your sexual life. In the following cases masturbation would be considered abnormal-
1. If you prefer masturbation over sexual intercourse with the partner
2. If you indulge in masturbation in public places
3. If you masturbate so frequently that your work or studies have started to get affected.
4. If the frequency or manner of masturbation is such that, the penis is getting injured or bruised.