24 hours, then safety hole if you're inclined to be hands-on... I've had them take longer than that and shorter than that, it varies greatly.So one of my eggs internally pipped this morning. When should you assist it externally pip (assuming you rather assist than let nature "death" take its course) I just don't want it to run out of oxeygen. I'm assuming it should take about 24 hours from internal to external? Am I right?