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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.
Fertilization: Sperm Penetrates Egg. It takes about 24 hours for a sperm cell to fertilize an egg. When the sperm penetrates the egg, the surface of the egg changes so that no other sperm can enter.At the moment of fertilization, the baby's genetic makeup is complete, including whether it's a boy or girl.he sperm can live up to 48-72 hours. Only a few hundred will even come close to the egg, because of the many natural barriers that exist in a woman's body. It takes about 24 hours for a sperm cell to fertilize an egg. When the sperm penetrates the egg, the surface of the egg changes so that no other sperm can enter.