I have a couple hens (1 red jungle fowl and 1 American game), each with a clutch of eggs on front porch. Front porch is next to bed room window that is kept open most of time, especially at night. Open window enables me to monitor sounds of "barmyard". The hens on front porch I have noticed, based on sound, seem to rotate eggs quite frequently. Seems like I can hear them rotate eggs almost hourly around the clock.