Yes. And no.
My own line of work is high tech manufacturing. The two businesses I've worked for effectively do not have any shutdown, yet are working to tolerances and complexities many many times what VW are doing (we're talkng about nm, not µm EDIT: actually even µm is probably a couple orders of magnitute smaller than VW look at
).
Now we tend to have a shutdown at Christmas, but this isn't really a shutdown, its just that too many people want holiday its better to close the whole plant than try to operate at 25% efficiency for 5 days. In terms of actual shutdown operations, these are either done on weekends, last thing on friday... or most often in parallel with normal operations.
What I'm saying is I don't think any of VW suppliers will have a shutdown like VW do. Probably not even 1 week. In rare cases they might close production for a day, but having a scheduled annual shutdown, I don't think so. But if anyone knows for sure it would be interesting. The one case I'm not so sure about is the DSG supplier.