How long does it take for an egg to mature and ovulate?

If the menstrual cycle of women, ovulation is generally in the next menstrual period before 14 days or so, normal monitoring of follicles and ovulation can be carried out under B ultrasound, in the 10th day of menstruation began monitoring, follicles will gradually increase, when the diameter reaches 18~25 mm, follicles can reach maturity, there is a possibility of ovulation.