What is the hatch period from start to finish for ducks?

[Zrach]

I have a small clutch of eggs that my duck is brooding and so far only one has hatched. How long should I wait for the remaining eggs to hatch before I clean them out of the nest? Im just worried about a blowout. I keep reading conflicting information. Some say they all hatch within 24 hours and some say it can take days.

 

[Isaac 0]

How did your hatch go? You would candle to check for their viability.