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The average menstrual cycle lasts 28 days, from the start of menstruation to the start of the next menstruation. The "bleeding phase" typically lasts 5-7 days.
The average is 28 days but it varies with each girl.
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.
28, I'm told, though in practice it seems to vary. 25-30 is probably a good bet.The average menstrual cycle length is 28 days - but there can be a lot of variation from one woman to the next, thus they can be shorter or longer.
There is no 'safe' period. Pregnancy can occur at any time during your menstrual cycle.