Does a guinea hen need to set on her eggs for them hatch?

Yes, guinea hens need to set on their eggs for them to hatch. Guinea hens are ground-nesting birds, and the female will typically lay her eggs in a well-hidden nest on the ground. She will then incubate the eggs for 26-28 days, during which time she will rarely leave the nest. The male guinea hen will often stay close to the nest and protect the female and the eggs from predators. Once the eggs have hatched, the chicks will stay with the female for several weeks until they are able to fend for themselves.