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 menstrual cycle usually lasts approximately 28 days. The first day of the cycle is the first day of a womanâs period (menstruation). The period â which usually lasts for 3-7 days - is made up of blood and the uterus lining. It passes out of the body through the vagina.