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Every month there is a small window of opportunity for a man and women to conceive, so timing is very important. An egg can be fertilized for a maximum of 24 hours after it is released from the ovary, according to pregnancy and childbirth expert Sheila Kitzinger. Therefore, a woman needs to understand how her menstrual cycle works and make an educated guess about when she will release an egg, also known as ovulating.
The shell is created by calcium deposition around the forming egg within the uterus. The fertilized ova takes approximately 4 hours to travel to the uterus. Once in the uterus, calcification of the egg's shell takes approximately 20 hours. This is why a hen can only lay one egg per 24 hour period. About 15 minutes after the first egg is laid, the hen ovulates again and the process is repeated.