How long is a menstrual cycle

Most women believe the average menstrual cycle is 28 days long, but cycles can range from 23 to 35 days. Read on to learn more about periods and fertility.
Do you know how long a menstrual cycle is? You may answer with the textbook 28 days, but a study of more than 30,000 women found that 87% had cycles that fell in the range of 23 to 35 days1.

Menstrual cycle - Wikipedia

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Is there a scientific explanation for the length (28 days on average) of the menstrual cycle? - Quora

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