There is probably nothing "extra" about it, it is very likely part of their original plan for getting rigs out fast, of course you're going to work weekends, if your competition doesn't thats two days you gain on them every week...

They knew from the start it was a "formula one race".

Don't races take place even on weekends? Do they dismiss all but one of the pit crew to save a few bucks?

Plus are Swedish electronics factories hundreds or thousands of coolie labourers or are they largely automated with an engineer or few sitting around watching Simpsons or whatever but ready to jump if the machinery decides to act up? Why give your robots days off? How much do you lose letting your automation stand idle all weekend?

-MarkM-