How long from pipping internally--update, two pipping!

I am just wondering, not panicking.
Last night candled all of my duck eggs (they were on day 24). Most of them looked like they were pecking at the membrane towards the air cell. One looked like it had broken through and pecked at the light! I could hear this one peeping and tapping against the shell.
I went ahead and laid all the eggs on their side in preparation to hatch, making sure the ones I could see pecking were face up.
I am just curious now when I should see external pipping from the one that had internally pipped? I know it is still early for them to hatch, just kind of expected something this morning considering that the one was already peeping and pecking.
This is exciting!
Thanks!

 

Thanks everyone! I have one with several pips (working on zipping), one barely pipped, and one rocking. . .looks like they are on their way! Two days early!!!
Of course when I peeked in the incubator I also immediately saw that my temperature had spiked to 102.5, so like an idiot instantly raised the lid to lower the temp. . .I ended up having to take out both vent plugs and open a window in the room, and now it is down to 101.3 (It usually sits at 100.5, so is still on the high side). I am not worried about the humidity because it never dropped below 65% (I have a homemade incubator made out of a large cooler, so the humidity holds pretty well), but I hope the temperature spike didn't hurt any. . .
Send me your hatching vibes! Babies on the way!

 

Ok, one more is pipping now. . .Hopefully I will have babies when I wake up in the morning!