I generally will wait 2 days after "due date" on eggs but that's chicken or duck. I believe you were hatching quail. In that case probably a day and a half.
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Yay!6 have hatched so far. 5 more eggs in the incubator waiting. Two I can see are pipped.
Yay!
Will post pictures once they are fluffed and dry
The ones from last week are starting to get their feathers
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Day three you might be able to see some veining, but it might not be definite until day 7.
Barnevelder hatched a little after midnight...I'll never cease to be amazed watching