How many days do you need to incubate eggs

It takes 13-15 days to incubate eggs.This bird is widely distributed, but it is not possible to breed all places. It usually flys to a special breeding area to breed, and it usually runs in the cave. This is more hidden.There are many materials in the nest, and there are often some soft things in it.Usually a nest can produce 4-7 eggs, and it takes about half a month to leave after hatching.