The egg is fertilized by the sperms within 24 hours. The fertilized egg travels down the tube, sits around in there for about 3 days then heads to the uterus floating around looking for a nice cushion, finds it, and implants about five days after it heads out of the tubes.ou ovulate once a month and the egg stays viable for 12-24 hours. If your trying to get pregnant, having sex before you ovulate makes conceiving more likely. Emily · 7 years ago. Thumbs up.