How long after pipping?

I have an egg that started pipping today, two days ago it was sweating. I have another that started sweating today.

How long after the "pipping" begins should it take for the little guy to get out of the egg? Is there a point at which I should intervene if he doesn't come out? Thanks, I'm nervous!:eek:
 
I've had some come out within a few hours of pipping and others that have taken a couple of days. But, on average, it seems to take about 24 hours.
 
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