A growing global experiment
The idea is simple: work four days instead of five, for the same pay, while maintaining the same output. What sounds like a utopian fantasy has been tested by thousands of companies across dozens of countries. The results have surprised even sceptics.
Between 2022 and 2024, 4 Day Week Global coordinated the largest trials to date, spanning the UK, US, Ireland, South Africa, Australia, and several other countries. The findings consistently point in the same direction: less time at work, more output, healthier employees.
What the research shows
The UK pilot, involving 61 companies and roughly 2,900 employees over six months, was evaluated by researchers from Cambridge University, Boston College, and Autonomy. The headline numbers speak for themselves.
Company revenue rose by an average of 1.4% during the trial period. Employee burnout dropped by 71%. Sick days fell by 65%. Resignations decreased by 57%. And at the end of the trial, 92% of participating companies chose to continue with the four-day week permanently.
In Iceland, the government ran two large trials between 2015 and 2019 involving around 2,500 public sector workers. Productivity either stayed the same or improved across nearly all workplaces. Stress and burnout indicators declined significantly. By 2022, 86% of Iceland's workforce had either moved to shorter hours or gained the right to negotiate them.
Microsoft Japan tested a four-day week in 2019 and reported a 40% increase in productivity. Electricity consumption dropped by 23% and paper printing by 59%.
Why less time can mean more output
This seems counterintuitive. How can people produce the same or more in fewer hours?
The answer lies in how we currently use our time. Research from Vouchercloud found that the average office worker is genuinely productive for only 2 hours and 53 minutes in a standard eight-hour day. The rest goes to checking social media, reading news, chatting with colleagues, making hot drinks, and context switching between tasks.
When people have four days instead of five, meetings get shorter or are eliminated. Busywork is questioned. Focus deepens because there is less time to waste. Parkinson's law, the observation that work expands to fill the available time, works in reverse too: compress the time, and people find ways to be more efficient.
The health and wellbeing impact
The productivity gains are compelling, but the wellbeing improvements may be even more significant.
In the UK trial, 39% of employees reported feeling less stressed. Anxiety levels dropped. Sleep quality improved. Workers reported spending more time exercising and with their families. The Boston College researchers noted a 71% reduction in burnout levels across participants.
For employers, this translates into tangible savings. Fewer sick days, lower turnover, and reduced recruitment costs. LinkedIn data suggests that companies advertising a four-day week receive up to 280% more job applications.
Where it works and where it doesn't
The four-day week has shown the strongest results in knowledge work: technology, marketing, professional services, and office-based roles. These are environments where output is measured by results rather than hours of presence.
Industries with continuous coverage requirements, such as healthcare, hospitality, retail, and manufacturing, face more complex implementation challenges. Some have adopted rotating schedules where employees still work four days each, but the business operates five or more days per week.
Belgium introduced a legal right for employees to request a four-day week in 2022, though the total weekly hours remain the same (compressed into four longer days rather than a true reduction). This "compressed week" model offers flexibility without reducing overall hours.
The role of time tracking
One common thread across successful four-day week implementations is the importance of measuring how time is actually spent. Companies that thrive with shorter weeks tend to be those that already had a clear picture of productive versus non-productive time.
Time tracking helps organisations identify where hours are lost to unnecessary meetings, redundant processes, and low-value tasks. It shifts the focus from hours worked to results delivered. An app like Work Counter can help by showing exactly how your hours break down across projects, making it easier to spot where time is being wasted. When you know exactly how time is spent, cutting a day from the week becomes a process of eliminating waste rather than squeezing more into less time.
What this means going forward
The four-day work week is no longer a fringe concept. Governments in the UK, Germany, Spain, and Portugal have all funded or supported trials. Scotland and Wales have explored public sector pilots. The evidence base is growing, and the results are remarkably consistent.
Whether or not your company adopts a four-day week, the underlying lesson applies to everyone: understanding how you spend your time is the first step to working better, not just longer.
See where your time really goes
Work Counter gives you a clear picture of how your work hours are spent, with project-based tracking and weekly overviews. Whether you're exploring a compressed schedule or just want to work smarter, it starts with knowing the numbers. Download Work Counter for free on the App Store.
