All of my girls are laying now except for my speckled sussex. She's 2 days over 7 months and nothing yet. Looking beautiful and awfully mature but no signs of squatting or nesting behavior, though she has a wonderful personality. My other three are laying pretty regularly even with shorter days, though they are a tad slower at the moment. My Black Australorp lady is far and away my rock star layer and her eggs are a clean 2 ounces each right now.
I just figure my speckled sussex will take her sweet little time.