Candle duck eggs..WHEN?

[1234duck]

I keep seeing different posts on candling but, I'm really not sure when is the best time to candle? The eggs have been in the incubator since Wednesday(4 days). When should I candle?... I hope these eggs hatch right.. I had some of them in the house under a warm light for about a week before incubating. And some of the eggs were in the nest approx a week before that.. Back to my main ?, "When" is best to candle the eggs? Thanks, Julie

 

[Funky Feathers]

I do it at day 7.

 

[critterranch]

https://www.backyardchickens.com/forum/viewtopic.php?id=304863


this is good one i started on day 4 then when you do day 5 is much easier to tell if you dont want to wait

if you want to wait day 6 or 7 is good