I think that was the information that I was told after reading it in print ( getting old the mind don't always remeber right). Also I was told that they do better hand turning them insterad of an automatic turner.Hmmm...I could incubate them in my hatcher and just hand turn them. The humidity is set for 65%. Everything I've read says to incubate with that humidity but then I have to get it higher during lockdown. I do have a broody but I can't see sticking 6 duck eggs under a silkie.
Good luck.