Andy and I put up this bluebird house March 5th. These bluebirds found it on March 6th. It has been 6 days since and that is long enough for them to have built their nest. Hopefully, we will have some egg laying going on for about a week. And according to AI, "Bluebird eggs typically take about 11 to 19 days to hatch, with an average incubation period of around 13.5 days. The female begins incubating the eggs after laying the last one, ensuring they hatch close together." So I am hoping for early April to see some babies.