Factories don’t manufacture cars anymore, they
assemble them. Component parts are delivered on a “just in time” basis from second and third tier suppliers. The OEM’s actually produce very little from scratch, with the exception of engines, transmissions, etc. even thise are asembled from supplier parts.
So ten weeks would be for vehicle
assembly, not manufacturing from raw materials.
Paint and frames are typically still built in the assembly plant from what I understand. Everything else is just boled on or plugged in.
Considering those facts, ten weeks seems like a pretty long time to me...