Duck eggs typically hatch in 28 to 35 days. The difference in time depends upon the breed. Eggs of commonly-raised breeds of ducks, such as the Pekin variety, take 28 days.
The Muscovy breed, found wild in South America and the southern United States, hatches eggs in 35 days. These ducks are also raised on farms. When bred commercially, all duck eggs are typically kept in incubators, or setters, where temperature and humidity are controlled. The setter turns eggs regularly like a mother duck does. A few days before the eggs are due to hatch, they are often placed in separate containers called "hatchers." Once the eggs are there, they are not turned.