4-Day Work Week 2026: Biggest Trial Results, Productivity Data, and What Type You Are

# 4-Day Work Week 2026: Biggest Trial Results, Productivity Data, and What Type You Are

> **Quick answer:** The largest 4-day work week study ever conducted tracked 2,896 employees across 141 companies and found that 90% of companies kept the model after the six-month trial. Staff turnover dropped 57%, burnout fell for 71% of workers, and company revenue actually rose 1.4% on average. The biggest predictor of success? It was not the industry — it was the personality and work style of the people involved.

The 4-day work week is no longer a fringe experiment. In 2026, it is a policy question dividing boardrooms, attracting endorsements from some of the most powerful CEOs in the world, and generating the most rigorous workplace science we have ever seen. The data is in — and it is more compelling than either side of the debate expected.

## The Biggest Trial Ever: What the 2026 Science Shows

In July 2025, the journal *Nature Human Behaviour* published what researchers at Boston College called the largest controlled study of the four-day work week ever conducted. The study tracked **2,896 employees across 141 companies** in Australia, Canada, Ireland, New Zealand, the United Kingdom, and the United States through a six-month trial of a 32-hour work week with no reduction in pay.

The findings were striking across every metric researchers measured: