The Average Menstrual Cycle is 25 to 30 Days Long The menstrual cycle consists of four parts: the bleeding phase (when a woman menstruates ad sheds her uterine lining), follicular phase (when an ovary matures an egg), ovulation (when a mature egg is released from the ovary in hopes of fertilization) and luteal phase (when the uterine lining thickens). This takes on average 28 days to complete this cycle. Your menstrual cycle should be the same each month, and the length will