Everyday I give my hens wet crumble feed around 4p.m. One of them went into the nest box not long after I took out their feed. I have just got back (about 5.20p.m.) from shutting them up - I thought I'd collect that last egg of the day and she is still sitting in there! It's dark and the others are all roosting. I guess she'll stay there until she's done. Is there an average time it takes once the chicken sits, to when she actually lays the egg?