What the latest bluetit eggs will lay/hatch eggs

[craigdaniel]

Seems to be alot of confusion in the sparrow terrace. Built nest in late april/early may, female been roosting/incubating in box for last three weeks. The box has three comparments which the pair are both using. No cameras installed, any advice much appreciated. No signs of chicks yet but male visiting more often past week.

[craigdaniel]

watched them again 2 day male bird still bringing catterpillars to box, female flies out still and flutters her wings for food then goes back been going on for three weeks now