The time for sperm and egg to meet after intercourse is usually about 2-6 hours. If intercourse coincides with the woman’s ovulation period and the woman’s egg is able to be expelled normally, the sperm and egg usually meet within 2-6 hours. If the woman’s egg has not yet been expelled at the time of intercourse, the time for the sperm to meet the egg will be delayed. After the sperm and egg have met, the time to form a fertilized egg is within 24 hours. Fertilization is strongest within 24 hours after the egg is expelled and within 24-48 hours after the sperm is expelled. If you want to increase the chances of successful fertilization after intercourse, you need to accurately predict the woman’s ovulation day and have intercourse 1-2 days before and on the day of ovulation, or within 1-2 days after the day of ovulation, as the chances of conception after intercourse are small after missing this time period.