How many days does it take to hatch eggs

It takes 15 days to hatch eggs in white faces.The breeding ability of this bird is still good. It can be reproduced twice a year. Usually, it will be made from April to May. It can be in March earlier.The nests are generally done in tree caves or wall holes, or other birds are used abandoned.Its nest is generally 2-6 meters from the ground. After doing a good nest, it starts to lay eggs. One day is produced, and the last one will hatch.