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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.
1 The average menstrual cycle lasts 23-35 days (counting from the first day of one period to the next). 2  Some women may not have a regular cycle (number of days between periods). 3  This is normal, especially in the first 2 years after a woman's first period. 4  Most women have their period for about 6 days. This is normal, especially in the first 2 years after a woman's first period. 2  Most women have their period for about 6 days. 3  Some may have it fewer than 6 days and some may have it for more than 6 days.