How fast can one build a prefabricated house?

Question: How fast can one build a prefabricated house?

Hi! You can have a prefabricated house in 5 days!

Prefabricated house parts or panels and modules are built in the factory ready made. And then they are just delivered to the home owner and placed on the foundation. Of course, the speed in building the house depends on the type of home you want, so the one mentioned above is not a hard and fast rule.

Source: "Prefab Houses Go Outside the Box" from BusinessWeek