Hi! I've never hatched duck eggs before, and am hoping for some advice from peeps on BYC! I ordered Khaki Campbell eggs. Ten of the twelve eggs arrived uncracked. I let them rest a few hours to warm to room temperature, then set them in the incubator last week. I candled two nights ago (day 5), and again tonight (day 7). I can't seem to see any development! With chicken eggs I'm used to seeing lots of veins by day four or five. How long should it take for these ducks? I can see air sacs and yolks, but nothing else. Thank you!