How long do you give your eggs past 21 days if they have not pipped- to candle/do something?
If there is no action on day 21, I would candle! I usually candle twice a day (morning and night) during lockdown, before any external pips so I can check for internal pips.
I am not sure the exact brand of the incubator, got it off Amazon. The temp has been 99-100, humidity was at 50-60, for the first 25 days. The automatic Turner turned every 2 hours. The air cells had been getting bigger at a nice pace so I didn't measure except one week when I couldn't be sure. They did get bigger after I had compared a few days later.
I did pull a couple out, at the recommendation of a friend and experienced hatcher a bit ago, to candle and saw that 3 had piped internally. 1 of which has what looks like a line where it may be trying to pip through. One small external pip on another.
Edited to add that the ducks are Pekin/Appleyard cross. Everything I read says 28 days is typical.
Is it forced air?
Well, he didn't do it for me so I had to.broke my heart, but I know it was the right thing to do. Poor thing was gonna be a frizzle too. Fact of hatching, some just don't come out right. But happily I have 6 beautiful ones.
ETA - my first ever cull, but I was proud of myself for doing it.

Both ducklings hatched!! Second one has a pinhead sized belly opening that should close quickly. The first one is already stumbling around and the second is trying!!!
Thank you, everyone. I appreciate all the help, suggestions and support. Thank you so much.

Loving this threade
Its my first time incubating and I have had two chicks hatch out in the last few hours. I should probably mention that i am 14 years old, and have been helping chicks out of their eggs for a long time now and have never had any troubles, its nice to know that I seem to be doing okay. However my system simply consists of chipping away at the egg. I am absolutely loving Backyard chickens! I am just starting to get into pekins, so i can start getting into some propper breeds as opposed to the mixed up lot we have
Oh and when can i start cuddling my little bundles of joy?
Thankyou everyone!!!![]()

Ok, so one that piped first seems stalled, though it hasn't been 24 hrs. It has been like this for a few hours. What do I do?![]()
I wait a minimum of 24 hours, usually more like 30. Just keep a eye on it and make sure it's peeping and membranes don't seem dry.