As others have pointed out - it’s the city of Glasgow trialing this work week. That said, in most (all?) countries, workplace is a regulated relationship. That

As others have pointed out - it’s the city of Glasgow trialing this work week. That said, in most (all?) countries, workplace is a regulated relationship. That means there are labor laws and you as an employer of others have to follow them. Even as an employer of self, some laws still apply. In some places you cannot require 6 days a week, in others you can but must pay overtime. As a society we agree on certain concessions with our rights in order to protect others. If you don’t like the concessions a given society has made, look for one that meets your values better.