Claim
The largest study to date (141 firms, ~2,900 workers, six countries) found that a six-month four-day week reduced burnout and improved job satisfaction and mental and physical health, with self-rated performance maintained or higher.
Evidence (2)
Work time reduction via a 4-day workweek improves workers' well-being (Nature Human Behaviour, 2025)
Peer-reviewed study across six countries finding income-preserving four-day weeks improved well-being; self-rated performance maintained or improved.
https://www.nature.com/articles/s41562-025-02259-6
Biggest Trial of Four-Day Workweek Finds Workers Happier (Scientific American)
Coverage of the Nature Human Behaviour study; reports reduced burnout and that ~90% of firms kept the arrangement.
https://www.scientificamerican.com/article/biggest-trial-of-four-day-workweek-finds-workers-are-happier-and-feel-just/
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