mine start at about 6:00 as it is starting to get lighter earlier now in the morning and they keep it up steadily til about 7:30.... by 8 they are just making the usual happy hen chuckling sounds... i actuallyt hought one of my hens thinks she's a rooster... i gave two hens to someone in our kibbutz, his house has a whole valley below and he can keep noiser animals, but i took one noisy one out, so now the others are being super noisy... actually, it sounds annoying and noisy to me because it is such an insistent call, and ihear it stronger then my downstairs neighbhors. (windows closed since its winter, and only mine are open a bit)... waiting for summer, wondering what they will say (the chickens and the neighbhors.
at that hour anyhow we have tractors going past under our backyard, and the sounds of the chicken pellet truck when it comes to fill the silos (horrible vacuum noise that goes on for two hours), i can hear the mechanical feeders rolling in teh coops; dogs start up barking also around that hour, in general 7:00 is an acceptable time in our place for morning noise except on saturdays (shabbat) when people sleep in.
fortunately, other neighbors have started saving vegggies for the hens (their kids like to feed them) and i give everyone fresh eggs, so that is a salve for irritable neighbhor syndrome in the mean while. one neighbhor even told me they wouldnt mind if i had a rooste r(we used to be an agricultural village anyhow, jsut the newcomers are animal noise senstivie), although not all the neighbhros would agree, so not going that route.
we also have the mating cats when its the season, and the falcons start up with their nesting in our rain gutters, so i guess the clucking chicken noises have become part of the background, hopefully...