I assume that as well!
Congrats!! mine are hatching now!
I am not sure at all! have you posted in the duck section to ask? you will have to candle and watch for draw down of the eggs to figure out their incubation periods as soon as you see the big drop LOCK DOWN
see here for draw down info:
MARKING AIR CELLS DAY 18, DRAW DOWN, INTERNAL PIP, EXTERNAL PIP, and ZIPPING post #35770
Pips and ZIPS ARE NOT THE SAME PATIENCE is a MUST!