I have kept an egg diary since my chickens started laying at the beginning of January. Based on seeing them in the nest boxes (and watching some of them lay eggs), I know who lays which egg. In my egg diary, I keep track of who lays when, and I weigh the egg on my vintage 1940s Farmway egg scale. They do lay about every 26 hours; each day the chicken lays a little later in the day. When the chicken would naturally lay after dark, she seems to hold it until the next AM. From my egg diary, I have learned: My smallest egg layer BR (small side of Medium) rarely skips a day. She may not lay the biggest eggs, but she lays almost every day. My largest egg layer (XL) NHR, skips pretty regularly. She probably skips about every 6th day. My EE who lays M-L eggs, also skips every 6-7 days. My BR who lays grainy-textured eggs (L or XL) does skip more days than the other BR, but not as many as the NHR or the EE. In summary, without my egg diary, I might think my NHR with XL eggs was the best layer, and almost want to cull the BR laying medium eggs. However, I realize that the consistency of the BR laying makes up for the smaller egg size. The NHR with XL eggs is my least favorite chicken and I was going to get rid of her until I realized she lays the biggest eggs. The BR laying medium-small eggs is also not my favorite, and I was considering sending her and the NHR off together. As the gals collectively produce more eggs than I need, I have decided to appreciate the fact that they have different / unique egg laying patterns, and not worry too much about productivity. I think they will all get to stay here.