In a week what amount of masturbation is normal... though it differs from person to person.....?

Try to limit it to no more than once daily. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines

There is no 'normal'. What ever makes you happy. Just remember moderation in everything is healthy. Yes it differs from pe5rson to person