[/IMG][/IMG] growth can be seen in as little as 4 days but can take up to 7 days. The temperature is critical for the growth to start. Be patient and make sure to turn them a few times everyday. I have had eggs that remained for a few days halfway down incubation at room temp when my incubator way down for repairs and when I put them back they grew normal. One thing I can say about duck eggs they are very hardy.
This is my incubator my husband and I made. It is working great with my chicken eggs but so far when I candle the duck eggs nothing has been growing in them and I know they are fertile. I have a fan in that pulls in fresh air as well. How many days do you wait to candle your eggs?