I'm quite a talented candler :) Usually 48 hours I can see unless they are incredibly dark.
Either way, I really lucked out. I got some really good birds out of that hatch.
I had 30 Barred Plymouth Rocks hatch on a Thursday and Friday when they were due on a Sunday. Didn't lose a single one, but it sure confused me. I candled them on day 2, because I was so excited to check fertility... One was cracked so I opened it up to check fertility. They were developing more...