Okay, I got 3 Welsh Harlequin eggs from a neighbor. I was told ducks have a 28 day incubation period. So I incubated them all together about halfway through I candled them and only 1 of the 3 was developing. So I took the 2 out and left the good one in by itself. Day 25 I put it in lockdown..and... by day 28.... nothing. So I kept it in there an extra 4 days but still nothing... I figured it probably died in the shell so I unplugged the incubator took the egg out and decided to candle the egg..... To my surprise not only could I see the whole silhouette of a fully developed duckling, but it was moving, alive and pecking on the inside of the shell.. I quickly plugged in incubator back in and put the egg back.. So my question is.... what is the incubation period of a duck? Is it 28 days? Or something else? I am now almost on day 33 and I know for a fact the duckling is still in the egg alive. Could it just be struggling and I should help it at this point? Or should I just continue waiting to see if it hatches on its own? Looking for some helpful advice. Anything would be appreciated.