It can happen any time day or night. I usually cut my eggs when the first one goes, but as far as raising their heads out of the egg I've done a timeline on all the clutches I've hatched (albeit only 3 so far) and there has been no pattern; they just do it when they're ready. In my clutch of 5 that I just hatched this past weekend, I had 1 go during the night (18th), one around noon (18th), 2 around 7 pm (18th), and finally the last one went the next day (19th) during the morning. And they didn't leave their eggs in the order that they pipped either. They started coming out on the 19th and the last of them was out on the 20th.
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