production is a huge machine of suppliers delivering parts on demand - e.g. the chairs arrive exactly on the day that the chairs need to be mounted inside, otherwise is much more expensive to store, shelf, un-shelf, etc... expand thousands of times... and each supplier has its own suppliers, etc
also the tooling and all additional bits need to be correctly conserved, e.g. you can't leave sensitive measuring and calibration equipment out unused
this huge mechanism has a huge inertia. having it stopped in 2 weeks is amazing - but probably the supply chain was already working on how to stop the machinery in a way that's possible to start it again in some months