What do you mean won? The 40 hour work week was instituted during the Great Depression (hence why you see 1938 in the link) to try and get more people back into the labour force. The idea was that, like, if those working 60 hour weeks were forced into working 40 hours then 20 hours would open up for someone else, giving them some spending money to open up the economy again.
You need to read up on your history.
The 40 hour work week came in 1938. This is even echoed in the link, as mentioned earlier.
But it remains that 6 days per week was the norm prior to 1938, so 48 hours would be typical. We're talking about 40 hour weeks being typical. Stay on topic, my man. The 40 hour work week was not won, unless you think the Great Depression was caused by a labor uprising?
However, if you would have taken the time to read the thread, you'd have known that I already pointed all that out in my very first comment. The forest was seen all along. The only reason that other thought it wasn't seen was due to not understanding basic math.
These arguments were omnipresent at the time but they suddenly faded away when Hitler got his ass kicked. I wonder why?
I have no idea what you are trying to get at. If it is that wars can be won by working 40 hours per week, that is highly unlikely to be true. The 40 hour work weeks went by the wayside during the war. The US, for example, mandated a minimum of 48 hour workweeks in manufacturing during the war.
We need to react to it with the same intentionality that we did a century ago when we won the 40 hour work week, which still hasn't been entirely eroded despite half a century of chipping away.