It varies from woman to woman; but the cycle is normally 27 - 32 days long. The period itself is normally 2 - 4 days.
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The menstrual cycle begins with day 1 which is the first day of bleeding. The last day of the cycle is the day before the next period begins.
The first day of a womans menstrual cycle is also the first day of menstruation.
2 weeks
28 Days
Irregular menstrual period means a period which is not a set number of days, it may be only a couple of days one cycle and then weeks the next. Irregular menstrual periods can also see irregular flow patterns so light then heavy one cycle, heavy all the way through the period of the next cycle.