Ovulation is seen after how many hours of the 'Peak' of the 'Up stroke' in this diagram here :
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.
0-6 hours
10-12 hours
12-24 hours
24-36 hours
Normal Menstruation, Abnormal Menstruation, Menopausal Physiology and forsight of conception