They differ for each person and depends on many things. Birth control, health issues, even as simple as hormones can determine your periods and how long they will last

17

Typically girls have a period once a month. But sometimes medications or other health conditions can change that. I’m one that got lucky enough to consistently have a very regular period

3

Well periods differ for each person, and it depends on if they take birth control or not, but for me it’s usually once a month for 7 days

1

I have about 13 because of shorter cycles

1