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On an average a period lasts between 3 to 5 days. It is normal for a girl to have irregular periods in the beginning.During this time, the duration of her periods may vary from as short as 2 days to as long as 7 days. It can take up to a year for periods to become regular.n an average a period lasts between 3 to 5 days. It is normal for a girl to have irregular periods in the beginning.
Periods. A period or menstruation is a part of the menstrual cycle.On the average, the duration of a menstrual cycle is twenty-eight days. For some, it may be as short as twenty-one days or it may last for thirty-five days.