That's how long it takes two house martins to build a little house of clay and mud! This is a photo I took last year of one of the nests that were built under the eaves of our house. This year there are sixteen nests on the North, South and west sides of the house but none on the East - I don't know why.
Some have been occupied for nearly two months while some were building them today.
A lot of the migrating birds - especially swallows and swifts were blown off course in Greece this year. They had horrific storms and fierce winds in April.
I am so glad to see that so many of the housemartins think our house is a good place to call home....