While the average is to have eggs 27 to 30 days after a pre-lay it can vary depending on other factors such as heat, the animal itself etc, I have had eggs in the past 50+ days POS not this is not common and could be cause for concern even eggs that are 35 days POS could be cause for concern but that is where knowing your animal and experience comes to play.

You need to make sure the animal shows a normal behavior, is not abnormally swelled up and does not appear distressed.