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The menstrual cycle (also known as period) is counted as the time from the first day of one menstruation to the first day of the next menstruation. The average duration of the menstrual cycle is 28 +/- 7 days, but can vary quite a lot from woman to woman. But during first two to three years after menarche, periods can be irregular. The normal duration of menstrual periods is 3-7 days. Upto 70 ml of blood comes out in these days. If the flow is for more than seven days, it is excessive and can make the girl anemic. Menarche can happen anytime between 8-14 years. Beyond 14 years menarche is considered delayed. If the girl does not start with her periods even after 16 years then she should see a doctor or gynecologist. Women might reach menopause (cessation of menstruation) anywhere between forty and sixty.