I know Sweden has promoted the 6 hour work day. A couple of companies tried it and it was quite successful in the way that employees were happier and healthier and the productivity often stayed the same.
https://www.replicon.com/blog/five-takeaways-from-swedens-six-hour-workday-policy/

People need time to reenergize and by making longer days your productivity goes down.

Although the experiments had good positive results they went back to the old 8 hours because it was still too expensive.

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