How many days do you need to incubate eggs

It takes 21 days to hatch eggs.This bird is mainly living in Asia, and other regions are also introduced.It begins to reproduce in March and April. When breeding, it will be shouted first, and then it will mate.In order to better incubate eggs and care, it is usually made of nests, but the nests are very simple. Generally, it is composed of dried grass, branches, etc., and some feathers will be matched.It can produce 3-6 eggs in one nest, and it can reach 8 times.