I would personally find it odd if you didn't have one pip by then but then again, I've always had one pip by day 55 incubating at 98•.
If you don't cut and there is a problem, you could end up with babies in trouble. If you do cut and there is a problem you're in the same boat.
Honestly, I'd wait until the last night before you leave and then make your decision. If none have pipped but they candle good with veins and movement, then I'd cut a small flap just to be sure all babies can make it out.
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