I agree we don't put in a full 40 hours. Unless someone is working a 1950's style assembly line (meatpacking plant for example) few will put in those 40 hours even in manual labor ---you're chatting, playing around, etc. for some time.
White collar work, is of course, way worse. There is a lot of slack time in between tasks and meetings and so on.
So during those 40 hours, let's say a person delivers 100 work units. If we were to say, from now on you only have to work 32 hours, some people will still deliver 100 work units, but many will deliver an approximation to 80 work units. Many people will automatically adjust. People have a "pace of work" that is like breathing.
White collar work, is of course, way worse. There is a lot of slack time in between tasks and meetings and so on.
So during those 40 hours, let's say a person delivers 100 work units. If we were to say, from now on you only have to work 32 hours, some people will still deliver 100 work units, but many will deliver an approximation to 80 work units. Many people will automatically adjust. People have a "pace of work" that is like breathing.