Anything over 14 days should be discussed with your doctor.
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Girls have their period once a month for as long as their body needs too. The start it about at 10-13 years old and quit as an adult.
28 days
5-7 days
A line graph measures data, usually over a time period. The time may be a long period or short period.
The average menstrual period is around 5-7 days in length, and can very a little from cycle to cycle. As long as your period doesn't go over 14 days it's fairly normal, if it does go longer then see your doctor.