Day #1, 6 hours, and two minutes of duck eggs. Together there's 16 or 18 in the incubator... I don't remember how many. Wish me luck, m'dears.
With the duck eggs I can't candle til day 7 to see anything I think... Chicken eggs you can candle as early as day 3 to see if there are veins, and sometimes there will be slight movement... It's best not to candle them that early though... Day 7 & 14 are ideal... But if you're anything like me you won't be able to leave them alone. Good luck and happy hatching!