After ovulation, the egg lives for about 12-24 hours. Fertilization can take place only during this time period, but the sperm needs at least 9-12 hours inside the woman's body to get ready.That means, your chances getting pregnant are minimal if you make love more than 12 hours after ovulation.ertilization can take place only during this time period, but the sperm needs at least 9-12 hours inside the woman's body to get ready. That means, your chances getting pregnant are minimal if you make love more than 12 hours after ovulation.