No external pips until day 21! Out of my 3 viable eggs 2 hatched within 24 hours. I had to wet the membrane on one and totally didn't see that a second egg was already zipping! She wound up being bound by the membrane and I helped her out and got her sufficiently wet. Both are healthy the third Never pipped and died, so I hatched her and she had a MAJOR defect, her brain growing outside of her head and no skull!!