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.
The duration of menstrual periods varies from woman to woman. Menstrual cycles typically last between 21 and 35 days, with three to seven days of bleeding. However, if bleeding lasts for over seven days, or if there is minor spotting throughout the month, this is considered an abnormal prolonged or continuous period.