https://www.jstor.org/stable/1820827?seq=1#metadata_info_tab...
In fact the hours were starting to change to 40 that year. Funny coincidence.
https://en.wikipedia.org/wiki/Hours_of_Work_(Industry)_Conve...
Edit: Did some more research and in 1890 we have some truly ridiculous numbers. http://www.pbs.org/livelyhood/workday/weekend/8hourday.html
But there's a good reason we turned from those.
Is it though? Most people aren't you and I. Most are working hourly jobs and their employers are not paying out overtime.
My only meaningful point is that a shorter work week would likely only benefit those among us who are already better off (in terms of compensation.) I don't see how it helps my friend working at the Chrysler plant.
I believe slavery already won this category