Ductwork installation in a home can occur at two different times. The first is when the home is being constructed. This is the simplest option for ductwork installation, as it allows specialists to see the entirety of the home and design an efficient system built into the structure's frame. The second is installing after the home has been constructed. In this case, specialists need access to the home's ceilings, floors, and walls and often have to be creative within the lived-in space. Regardless, ductwork installation typically takes between 30-40 hours.