how long after you set the eggs should you start seeing an air cell? on my first hatch (not hatched yet) they already had air cells when i took over the incubation process ( after hen abandoned nest). i started my first official hatch on 10/13 and i candled the eggs on 10/16 when i locked down the other eggs to see if there was an air cell or veining yet but nothing that i noticed. i was wondering about how long it takes before i should notice the air cell. surely there should be one in my eggs by the time these hatch (due 10/19 -10/20) right?