Menstruation, Menopause, Abortion, Abuse Exam 2 Practice 2026 - Free Exam Practice Questions and Study Guide

Over a woman’s reproductive years, the number of menstrual cycles comes from roughly one cycle per month for about four decades. If you estimate about 12–13 cycles per year for around 40 years (from menarche in the early teens to menopause in the late forties to early fifties), you get about 480 cycles, with some variation. Pregnancy and breastfeeding can pause cycles, and cycle length can vary, but the overall total stays in the ballpark of a few hundred. That’s why the approximate range of 400–500 cycles is the best fit.

The other ranges don’t line up with the typical time span and cycle frequency: 50–100 would cover only a few years of cycles, 600 would require more cycles per year than is usual for four decades, and less than 100 would miss most of the reproductive period.