You can't predict how long your first period will last because you need to keep track of how long your first few lasts in order to predict how long one will last. For most people it lasts about a week.
it can last 3-7 days
6 weeks
it will take 10 to 15 days .
You work out how long it is since the FIRST day of you last period.
Most periods last from 3-5 days but it can vary from person to person.
About 10 days.Mine lasted 4 days but everyone's is different.
well the first couple years is irregular so when you first start you period it can last up to 3-15 days at the most. and about 24-28 days until your next period(:
A cycle lasts 28 days so count 28 days from the first day of your last period
If my last period was on the first of December when is my next period due?
it does not have one
Average is 5-7 days. Everyone is different. Some will last 3 days. Others may last 10.