Nine hours of machining just to cut (possibly including polish, assembly, more polishing) one steel link band for example. That's quite the bottleneck during manufacturing. It'd be ridiculously expensive to have hundreds of CNC machines and lots of manpower to degrade and polish all these little bits of metal all dedicated just to this one single item.
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I really feel I again need to point out something important here that can often be VERY misleading with Official Statements like the Nine Hour one.
Whilst I have no idea without seeing the machine and the factory, you really need to understand something very important in the use of words here.
Indeed, it probably does, if that's what they are saying take 9 hours for one fine loop metal strap to be made. However that does not mean they are making one every 9 hours.
Let me put it another way, Say I'm making tinned corn, the corn comes in at 6am, gets washed in the auto washers, it goes thru a long steamer, then thru the circular cutter than strips the corn from the cob, then onto more sorting for bad bits, then perhaps another steam, then the kernals get a spray of something, then it's off to the packaging dept, the tins are prepped and the corn gets put into the tins with some brine water, then they are cleaned, new labels applied, a inkjet prints on the best before date, then are then packaged, and all finished and ready for sending to the shops by 3pm that same day.
Official statement:
"It takes 9 hours from start to finish to create this completed tin of corn ready for your table."
Well, yes, that is totally true.
However, there were tins of corn coming off the production line constantly at the rate of one every 5 seconds as they move thru the factory!
Whilst I know we are not talking about tins of corn, I hope you understand what I'm saying here, and how these statements are misleading.
It does not mean, fire up the machine, put in some metal, and 9 hours later 1 watch strap is all done.
They could be making 100 a day ,and they still take 9 hours from start to finish.