What is the average of masturbation? how many times a week or a day? is two or three times bad?

Average unimportant: In and of itself, masturbation is a benign and healthy activity. Frequencies vary widely, from "never" to "often"; masturbation is only problematic if it, or related activities like viewing pornography, intrudes or interferes with other activities or relationships. There is no magic "normal" frequency.

Personal preference: Masturbation frequency varies from person to person and age and stage in life. As long as it isn't interfering with your work life, personal life, or intimate relationships, whatever frequency you choose should be fine.