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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 thing is that sperm can live up to five days waiting for that egg which is what happens in ovulation. The egg matures and drops then lasts for 12-24 hours. If there is sperm in that time and if it fertilized the egg then it travels up the fallopian tube. Soo it depends on when she ovulated. However let us assume that she was fertile then she would need to give it 2 weeks after sex to be reasonably sure.