Well, it 48 hours a week vs 60 jours is the secret of the success of british & USA vs Germany during WWI :
* WWI = death by explosive * over work == more defaults => more of your soldiers killed less of theirs, more money spent * so british army edicted a ban on overwork ~ 1917 followed by USA.
The question is does it matter more to produce the most defective products, or to produce stuff that works?