How long should someome only just starting their time of year flow for..How abundant days?

My daughter just started on Christmas Eve & she go for 16 days. And she is only 10yrs behind the times. My beginning period lasted 5 to 6 days, and my sisters simply lasted 2 to 3. 16 does come across like closely, so maybe you should purloin your daughter to the doctor to be safe. At lowest call the doctor.
is this 16 days of spotting and hurricane lantern bleeding or 16 days of heavy flow? theres a big difference. if 16 days of unhealthy flow i suggest taking her to the gyno if it happens again subsequent month.