You know, I spoke too soon, because the very next day of my post here, one of my girls laid an egg, and she's been laying almost every day since! But the eggs are so small--like an elongated quail size egg. I hope this isn't the norm for Buckeyes. My RIR's lay giant eggs that don't fit in the cartons half the time. Should I cut back the lights so she stops laying until she's really ready?
It can sometimes take a while for pullet eggs to round out, or for them to not lay double yolkers, or to reach Large in size. It's all about the laying apparatus getting tuned up. Once they are a little older you'll be getting Large eggs from them. The American Egg Board grades Large eggs as weighing 24 ounces per dozen, minimum. See this page for more info on grading and sizes: http://www.aeb.org/foodservice-professionals/egg-products