The five-day work week, a fixture of modern life since Henry Ford popularized it a century ago, is finally facing a serious challenger. Countries around the world are experimenting with — and in some cases permanently adopting — four-day work weeks, and the results are overwhelmingly positive.
Iceland led the way with landmark trials between 2015 and 2019, involving over 2,500 workers. The results were so successful — productivity maintained or improved, worker wellbeing skyrocketed — that today 86% of Iceland's workforce has moved to shorter hours or gained the right to negotiate them.
The UK followed with its own major trial in 2022, and by 2026, over 200 British companies have permanently adopted the four-day week. The data is compelling: 92% of participating companies reported maintained or increased productivity, while employee burnout dropped by 71%.
Belgium became the first country to legally enshrine the right to a four-day week in 2022, allowing employees to compress their hours into four days. Spain, Portugal, and Germany have all launched government-backed pilot programs since then.
Japan — a country long associated with overwork culture — surprised many by embracing the trend. The government began encouraging companies to adopt four-day weeks in 2021, and by 2026, major corporations including Panasonic, Hitachi, and Microsoft Japan have made the switch.
In the United States, adoption has been slower but is accelerating. Several states, including California and Maryland, have introduced legislation to incentivize four-day work weeks, and tech companies have been early adopters.
Critics argue that not all industries can accommodate shorter weeks, particularly healthcare, manufacturing, and retail. But proponents counter that creative scheduling can make it work. "It's not about working less," says Andrew Barnes, founder of the 4 Day Week Global movement. "It's about working smarter."