Whats the incubation period of a call duck?

[NGMBirds]

I'm trying to hatch some call duck eggs and I was told the incubation period was 32 days. Is that right? I thought ducks
(except the muscovy) were 28 days.

 

[4-H chicken mom]

28 days for ducks, the muscovy are the ones that take 32 days.

 

[RedfogsFlock]

runners are actually 28.5 days to 29. Ours have always hatched on day 29.