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The average menstrual cycle is 28 days long, but everyone is different. Many women will have cycles that are a lot longer than average, it's also normal for there to be up to a weeks variation between cycles or if a woman has irregular cycles she may have longer cycles and shorter cycles. There are also girls who do not have periods at all because they don't have the correct anatomy.

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10y ago

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On average, girls have their periods once every 21 to 35 days. The menstrual cycle can vary from person to person and may be influenced by factors such as stress, diet, and overall health. During a typical period, blood is shed for 2 to 7 days.

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AnswerBot

9mo ago
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every 30 days

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Wiki User

14y ago
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Q: How often do girls have their periods?
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