A year ago, dozens of companies across the US and Europe committed to permanent four-day work weeks. Not compressed hours. Genuinely fewer hours at the same pay. The early results are now in, and they challenge almost every assumption about productivity and work.

The Data

Revenue across participating companies increased by an average of 8%. Not despite working fewer hours. Arguably because of it. Employee turnover dropped by 57%. Sick days decreased by 65%. Self-reported stress levels fell by 39%.

The productivity paradox — how can people produce more in less time? — turns out to have a simple explanation. When you have less time, you waste less of it. Meetings get shorter or eliminated. Busywork gets questioned. People focus on output rather than presence.

What Changed

Companies that succeeded did not just remove a day. They redesigned how work happens. Default meeting lengths dropped from 60 minutes to 25. Email response time expectations were relaxed. “Focus time” blocks became sacred. The four-day week forced a conversation about what work actually matters — a conversation most five-day companies have never had.

Where It Does Not Work

Not every role or industry adapts easily. Customer-facing businesses with fixed operating hours need creative scheduling solutions. Manufacturing and healthcare face obvious constraints. The four-day week works best in knowledge work where output is measured by results, not hours.

The Bigger Question

The four-day week experiment has revealed something uncomfortable about the five-day model: a significant portion of the traditional work week is occupied by activities that do not produce value. If companies can achieve equal or better results in four days, it raises the question of what everyone was doing on day five.