I believe up to 18 days. Don't remember where I got that information.I have a breeding question, I hope someone can help me. I don't have a whole lot of birds right now, and I have various breeds, so I'm kinda limited a bit as far as how many and of each color goes and I'm not going to have 1 rooster of every color of every breed that I have. If I were to breed a hen to a roo and then seperate them, how long would I need to wait before putting her in w/a different colored roo if I wanted to try a dif. breeding route? For example, human sperm can live for 4-5 days, is it the same for chickens? I want to know what eggs are from which roo and what colors to expect. Thanks!