This depends on what they really mean by "entered production." In any modern car plant, it takes about a day in each of body, paint, and assembly shops. This cannot be accelerated because the processes simply take that long and the conveyor lines have fixed speeds. (This is based on my experience in a plant building ~ 1100 vehicles per day on 3 shifts). I suspect "entered production" in this case means "started into assembly" with a painted body, and yes, a body can go all the way through assembly in less than a day if the plant is running really well.