how to hatch call duck eggs in a r-com 3 egg incubator

[ducksarecool12]

i have a r-com 3 egg incubator but call duck eggs take 26 days to hatch so i couldnt select duck cause it incubates for 28 days what would i do

 

[mrslb333]

Is there some sort of manual override?

 

[ducksarecool12]

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