How many days do I need to hatch eggs

The hatching eggs are generally 16 days.This bird is native to Asia and is distributed in many places in my country.Its breeding period is from April-August. Birds are usually made in the tree hole, and grass roots, grass leaves, feathers, snakeskin, etc. are usually matched in the nest.After doing a good nest, the birds will lay eggs. A nest can produce 4-5 pieces. In many cases, it can also be produced to 6 pieces. There are only 3 times when they are less.