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.
Identification. Menstrual flow is different for each woman, but usually occurs between day 28 and day 34 of the monthly menstrual cycle. On average, menstrual flow lasts about 4 days. A period that lasts longer than 7 days, in considered a prolonged period.