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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.
1 We know from in vitro fertilization studies that the egg is only capable of being fertilized for about 24 hours after ovulation.  It is not known why it has such a short functional lifespan after ovulation, but clearly something is rapidly changing within the egg.