Mine took a solid 18 weeks to lay in hot & humid Florida. Everyone will post that They'll get redder combs & such, but time is the real thing to wait for. They had very red combs for many weeks before I got eggs!!!
My Barred Rocks started laying @ 20 to 22 weeks. Combs and wattles, bright red, squatting when approached are signs. These are not a production breed so I would just chill for another month or so if I were you. You will really enjoy it when they do.
Our barred rocks are nineteen weeks old. Flora has been red for weeks and has a gorgeous wattle. Greta is red with a small wattle and may be squatting. Ruthie is just turning red with a tiny wattle. Ruthie and Flora were interested in the plastic egg in the nesting box. No one has laid. I am going away in a week and will be gone three and one half weeks. It would sure be fun if they lay before I go. Who knows?
I have a question along these lines too. I have 2 silkies hens, 24 weeks, 3 large breed, Columbian, BO, and EE, 20 weeks. I have 2 silkie roos also 24 weeks. NO EGGS!!!? I've looked for the signs people talk about, red comb, egg song practice, squating, roos wanting to mate. Each day I see one or two things, but the next day all signs are gone. The combs change color throughout the day, is that normal? The roos are trying to do their thing
I am totally frustrated with my girls. coyotes cleaned me out over winter so started with all new chickens early spring. I have several out of 21 'girls' that have been squatting for several weeks, I've heard the clucking screams and no eggs yet. I am feeding them Albers Layer plus lots of squash, berries, melons, and human clean corn on cob. They are treated like royalty!! Some are even 6 months already! I will have to get tough with them & threaten if they don't start laying soon!! LOL