Time required for ovulation from the onset of LH surge is
From the onset of the LH surge, it takes 34-36 hours and from the peak it takes 10-12 hours to ovulate. The midcycle LH surge is responsible for a dramatic increase in local concentrations of prostaglandins and proteolytic enzymes in the follicle. These substances progressively weaken the follicular wall and ultimately allow a perforation to form.
12 hours
24 hours
36 hours
48 hours
Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception