How many days does a woman's normal menstrual period last, and what is the ruling on prayer and fasting for a woman whose menstrual cycle exceeds ten days?

The days of menstruation vary according to women's habits, and usually range between five days and fifteen days as a maximum. Most often, it is between seven and ten days. If a woman has more than one habit, then if her menstruation comes and stops at her lesser habit, the matter is clear. If it continues, she completes her greater habit. If the menstruation exceeds her longest habit but does not exceed fifteen days, then it is menses. If it exceeds that, then it is Istihadha (non-menstrual bleeding).