Short time of year?

Im 13 and my period simply lasts 3 days or so. My friends vote theirs is up to 6 days or so. Why is mine so short?Short time of year?
It might just be ordinary
everyone is different, it's fine. Mine are 3-4 days and have other been.
usual
I'm the same road, and I'm 16. My doctor knows just about that and says that it is commonplace.
That's completely normal. They can finishing anywhere from 2-10 days. Count yourself VERY VERY VERY lucky!!
Of course since you are only 13 so far it will probably devolution over time. It might get longer, it might not. Mine used to finishing only 3-4 days but immediately it's 6.