Constructing a building should take some time, literal in game days seems reasonable. But for bigger builds... maybe Dev would be willing to make hammers have qualities that give faster/reduced construction based on higher quality?
Barring that, pre-plan your build so you know where everything is going before you start. This way you don't waste time and hammer durability on deconstruction and reconstruction tiles as you go.
I used graph paper to sketch and help me get an idea of how much tiled space I had so I can plan the building layout and furnishings.
Also, you can skip out on flooring under wall tiles besides doors, you can't see it and it saves on materiel and time.