Hey Christina,
Good question, I think it partially depends upon the chicken. Chicken education books say that the chicken takes on average 25 hours to produce the egg start-to-finish. If the average chicken laid at 8 one morning the egg would move an hour later each day. I read (can't remember where) that if the chicken hasn't ovulated by 3PM she won't and thus the next day won't have an egg.
My golden comet didn't read the book and she lays daily at around 9AM. -- The day before Easter she laid her egg at 3PM and then she took the next day off (Easter Sunday). Since then it has been daily around 9-in-the-morning. My two Barred Rocks lay nearly every day, but not every day, so they do vary. I have also noticed on about 5 occasions when I was around that they have laid their eggs in pecking-order-sequence. I haven't heard anyone talk about this before, but it kind of makes sense, the higher on the totem pole, the greater access to the nest box and the lower status hen has to wait.
It's a good idea to check the nest box frequently, to remove eggs, so they don't get ideas of how nice it would be to sit on eggs and go broody, and of course, the egg can't be harmed accidentally by another chicken if you have removed it.