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personally, i leave any questionable eggs in the 'bator until about day 10. then it's obvious if they're developing or not. but that's chicken eggs, don't know what incubation is for ducks. maybe add a day or 2. but pretty much by the time the chick shadows most of the egg, any clears are obvious. as for the ones lagging behind, i'd treat them the same until they either hatch or die... even tho all my eggs went in at the same time i'm seeing variation in how fast they're developing too, it looks like my dorkings are lagging a bit behind the EE's and the bantams are varying between them all.