Sounds like mine. When one hen lays an egg and starts the process of sqwauking they all join in and it can last a loooooong time. I can sympathize with you. When I was a kid we lived in a suburb of St. Louis and we just had one Bantam rooster and two hens and the neighbors couldn't handle that single rooster crowing in the morning. I have not answers. My mom and dad who both grew up on farms tell me that this is normal for chickens.