I never thought about that only that some pip one day and don't hatch until the next and others pip and within an hour they have hatched. I will pay attention.
Can only speak from personal experience.
My first one pipped last night at 6pm and hatched at noon today.
Last one is still working on zipping atm.
They've been going at approximately 12-24 hrs from pip to hatch with an average of 18 hrs.
Hope that helps and good luck on your hatch.