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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.
When a woman ovulates, the egg is able to be fertilized for 12-24 hours (1 day). When sperm enters the woman's body, it remains alive and able to fertilize an egg for 1-5 days. It takes emergency contraception from 12-24 hours to be effective (1 day). Emergency contraception remains effective for at least 10 days.