I'm only on day 13-14, and looks like I lost 2 in the last couple of days. So now from my original dozen from E-bay, 2 were clear at day 8, 3 had expired before day 8, one appears to have quit on day 12, and the last one died last night. I have the last two quitters still in the bator, but I'm pretty positive they are lost. The last two that quit also looked like porous eggs and had the "saddle shaped" air cells. I hope the last five will make it. There are a couple that are thicker and hard to candle but I still see veins.
One egg I threw in from my own chickens is still going strong.
This is my first batch and it is a depressing learning curve.