My flock are all about a year old. RIR, Americanas, and BR. Sometimes they will go into the boxes and lay their egg in ten minutes, but lately it seems that most of them are in there for an hour or more. Today a BR was in the nest for almost 7 hours before she layed. She is not broody, because as soon as she laid she popped right out of the coop and joined the others outside. Could this be something in their diet or is this normal?