The incubation period for most Pacific Parrotlets is 19 to 24 days. The hen will spend a majority of her time in the nest box taking care of and keeping her eggs warm. The hen will come out of the nest box occasionally to poop and replenish nutrients. The male parrotlet will be dedicated to feeding his mate either in the nest box or at the entrance hole. It is not uncommon to see both the male and female sleeping in the nest box with one another.
Note: Water should be changed on a daily basis, however, parrotletbirds.com recommends changing the water twice daily when your parrotlet breeding pair has begun the process of laying eggs, incubating hatching, raising etc.