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An egg lives for about 12-24 hours after you ovulate, and sperm can live for five to seven days. Ideally, you need a lot of sperm on stand-by to 'pounce' on that egg when it's released, so have sex in the days leading up to when you ovulate and a day after.
The egg travels very rapidly from the ovulation site to the fertilization site in the oviduct. The fertile life of the egg is shorter than that of the sperm. Ovulated eggs remain fertilizable longer (10â20 hours) than they remain capable of being fertilized and developing into normal embryos (8â10 hours). The likelihood of embryonic death increases as the time beyond this interval increases.