system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we still work 8 hours a day?

So many people are unemployed because machines can do many of the jobs that existed 50 years ago. 
Why isn't the time people work just lowered instead of staying the same for decades?
gpt
Actually overall there has been a gradual decrease in the average work hours. At the turn of the century work weeks were close to 60 hours per week. 

In the 70s the 40 hour work week became the norm and today the average worker works 33 hours a week. As you can see we are moving to less hours but the rate of change is very slow and intangible thus does not make us feel like we are losing work hours. 

In other developed countries there are 25 hour work weeks and some have just a 20 hour work weeks. 

Edit: all these people posting their own personal workday are being totally unhelpful to the OPs question about general society.