In the case of the B (or center) pillar on four-door sedans, the pillar is typically a closed steel structure welded at the bottom to the car's rocker panel and floorpan, as well as on the top to the roof rail or panel.
On an average a period lasts between 3 to 5 days. It is normal for a girl to have irregular periods in the beginning. During this time, the duration of her periods may vary from as short as 2 days to as long as 7 days. It can take up to a year for periods to become regular.
How Long Periods Should Last Most girls get their first period when they are 12 or 13, though everyone's different and you don't need to worry unless you still didn't get your period by age 16. When your first period arrives, it is most likely to last between two and seven days. [1, 2] As your menstrual cycle becomes more regular over time, the duration of your flow will also settle into a predictable pattern, and most women experience menstrual flow that lasts between three and five days. Some women will menstruate for only two days or up to seven days .