How long do ducks take to hatch?

[biffcstr04]

I have a muscovy that is sitting on her eggs and I just need to know how long it takes for them to hatch?

 

[klucas80]

Oldish post, so I'm sorry if there's another place to post this.

My muscovy laid 9 eggs but only one was fertile. I miscounted the days since she laid 4 eggs one day and about three days later, laid five more. I thought the baby would hatch on Easter but there was no activity. I thought the egg might not have progressed and the chick died so I went to get the egg only to find a pip and the egg jiggled hard in my hand. I quickly put it back and apologized to Mama. Lol. I'll give it a day or two and see what the progress is then. I'm so excited!!

 

[Joe1994]

Mine have started zipping however the membrane has gone a yellow brown colour