So far no eggs

I am not sure what is going on with Coco and Charlie! Charlie keeps ringing the bell, but so far no eggs! I don't really know how long it takes for them to lay eggs once they decide that is what they are going to do! Coco is spending less time in the nest box the past few days than she was. She never seems to get aggressive durnig breeding season and still comes over to gently take nuts from my fingers. Charlie, on the other hand, becomes far more protective of Coco and tries to prevent her from getting too close to us. I have been trying not to upset him and give them as much privacy as they want right now.