Q: I am menstruating for 23days even after seeing a gynecologist.can I fast and make salaah after the 12 or 15 day period? (text)

A: The maximum length of a menstrual cycle is 10 days, and thereafter you should resume fasting and performing salaah.  Bleeding which occurs after the full 10th day is called istihaza. (During Istihaza you would need to perform your salah with fresh wudhu for each prayer.)

The minimum period of purity between one’s cycles are 15 days.

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Allah Certainly Knows Best.