how many days, on average, does the menstrual cycle take to complete
Though the length and regularity of a menstrual cycle may differ, the average duration of a complete menstrual cycle is 28 days (though healthy cycles can run from 21-36 days).Below you will find an overview of a typical menstrual cycle with an image map based on a 28 day cycle length.Pre-Ovulation.hough the length and regularity of a menstrual cycle may differ, the average duration of a complete menstrual cycle is 28 days (though healthy cycles can run from 21-36 days).