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
right away
ok
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(:
Your first period lasts a while until you can recognize a regular cycle. Nothing to worry about, just stay clean and smelling good! :)
A cycle lasts 28 days so count 28 days from the first day of your last period
it does not have one