IMO I'd leave them for about the 10-14 days then check for fertility. Your trying to get her to go set but don't want any stink bombs to explode.
So it will have to be a balancing act I'm afraid
edited to add.. if they aren't fertile I wonder if your gonna have to substitute the eggs for another week or so

edited to add.. if they aren't fertile I wonder if your gonna have to substitute the eggs for another week or so

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