It takes a little time to build a house. Especially all by yourself. Add having to stop to bottle feed a hungry orphaned fawn bleating at the bottom of the ladder.
Or run back to The Home Depot for another box of nails because a House Wren has decided to build her nest in the $80.00 box you just opened and now there's a nest with eggs. Work goes slow perched on 2X8 straddled across roof jacks, nailin' on shingles when you see a baby Blue Jay fall out of it's nest in the crotch of a Maple tree. So you climb down and carry it back up. It's all good though and I wouldn't have traded a minute of it!