Is having your period for 20 days normal ?

-my sister has had her period for 20 days, shes only started around six months ago, is this normal ?It is not normal, but it can happen. My mother had a period for 21 days/3 weeks. If it continues, suggest a doctor. She could have problems with her reproductive system. A normal period is 3-7 days.No this is not normal and can be a sign of a medical problem. She needs to see the GYN.
i dont think thats normal :p even tho its still irregular. i hear long is over 10 days.... take her to the doc
Yes it could be because it's irregular at first.