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Every month there is a small window of opportunity for a man and women to conceive, so timing is very important. An egg can be fertilized for a maximum of 24 hours after it is released from the ovary, according to pregnancy and childbirth expert Sheila Kitzinger. Therefore, a woman needs to understand how her menstrual cycle works and make an educated guess about when she will release an egg, also known as ovulating.
The egg can be fertilized for up to 24 hours after ovulation. If it isnât fertilized the lining of the womb is shed and your period begins. This marks the start of the next cycle.While an egg is only viable for about 24 hours, sperm can remain active for up to five days. The soâcalled LH surge causes the release of the egg from the ovary and youâre ovulating. 2  Ovulation normally occurs 24 to 36 hours after the LH surge, which is why LH is a good predictor for peak fertility.