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.
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28 Days
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.
The average menstrual cycle is 28 days. Five days for the menstrual phase (when a woman's endometrium is being expelled, also known as a period), nine days for the proliferative phase (when the endometrium is developing), zero days for ovulation (when a ripe ova, or egg cell, is deposited from an ovary), and fourteen days for the secretory phase (when the endometrium continues to develop.