If it took Bombardier just six weeks after it announced the project's launch to fly the first prototype of the Learjet 40, and six days after that to fly the first production aircraft, how come it takes an average of 40 weeks to put the seats in a Global Express?

Speaking of which, the prototype 40 flew in natural metal, but the production aircraft flew in a full paint scheme, which means that it must have been completed around the same time as the prototype. So what's the difference?

Source: Flight International