something to remember is that you won’t always get an egg per chicken per day. they stop laying to molt (and will likely all at once if they are the same breed and age), and even during normal times when every chickens’ laying is ‘on’, individuals will take a day off when their last egg was later in the day. if you really want to be getting 5 eggs a day, (also what my family tends to eat, plus baking), you’ll probably want more than 5 birds.