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.
Your periods used to be regular, but they've become irregular. Your period comes more often than every 21 days, or less often than every 35 days, for several cycles. You bleed for more than seven days straight. You stopped bleeding for 12 months in a row (menopause) and are now bleeding again.