Inside the 4-Hour Workday Trial: Lessons from Experiments

The 4-hour workday has long captured public imagination. Advocates argue that shorter work hours could improve productivity, reduce burnout, and reshape modern work culture. 

In practice, however, very few organisations have attempted a true four-hour schedule. Most real-world experiments have tested variations such as five-hour workdays, six-hour shifts, or four-day workweeks. The results reveal a consistent pattern: extreme schedule compression is far harder to sustain than initially expected. 

While the 4-hour workday concept promises efficiency, the experiments that came closest exposed operational and cultural challenges that organisations often underestimate. A closer look at these trials reveals what actually happens when companies attempt to compress the workday. 

What was actually tested

Despite frequent headlines, almost no organisation has implemented a strict 4-hour workday. Instead, companies have tested several related models: 

• Five-hour workdays — Tower Paddle Boards in the United States 

• Six-hour shifts — nursing experiments in Gothenburg, Sweden 

• Four-day workweeks — multinational trials across 33 companies in 2022 

Each model attempted to reduce total working hours while maintaining productivity and salary levels. The expectation was simple: if employees had less time to work, they would work more intensively and achieve the same output in fewer hours. The outcomes varied widely depending on the type of work and organisational structure. 

The tower paddle boards experiment

One of the most widely cited examples linked to the 4-hour workday idea came from Tower Paddle Boards, a California-based company. 

In June 2015, CEO Stephan Aarstol introduced a five-hour workday schedule running from 8 AM to 1 PM. Employees retained their full salaries and also participated in profit-sharing. Aarstol had previously gained attention after securing $150,000 in investment from Mark Cuban on Shark Tank. The expectation was clear: employees would produce the same output in fewer hours by working with greater focus. 

However, the model required employees to sustain extremely high productivity levels every day. Within three months, four of the company’s nine employees had left the organisation. Aarstol later acknowledged that the pace was difficult to maintain. In an interview with CNBC, he noted: 

“We started attracting two types of people. One was the type we wanted, and we also attracted these sloth-like people.” 

The compressed schedule also affected collaboration and workplace culture. Aarstol later explained: 

“Company culture sort of trumps everything else there, and we were sacrificing that.” 

By April 2017, the company ended the permanent five-hour workday policy. It later reintroduced a modified summer-only version of reduced hours, typically structured as 25 hours across four days. While often cited as an example of the 4-hour workday, the Tower experiment ultimately demonstrated the limits of extreme daily compression. 

Sweden’s six-hour shift trials 

Sweden also conducted widely reported experiments with shorter workdays. One notable trial took place in Gothenburg, where nurses worked six-hour shifts instead of eight. The results were mixed. 

Productivity per hour increased, and nurses reported improved well-being and reduced fatigue. However, the hospital needed to hire additional staff to maintain full coverage. This highlighted an important operational constraint: sectors requiring continuous service cannot simply compress working hours without increasing staffing levels. 

Healthcare, manufacturing, customer support, and infrastructure operations all depend on consistent coverage rather than flexible output. These structural realities make the 4-hour workday model particularly difficult to implement in many industries. 

The success of four-day workweeks 

Large-scale trials of four-day workweeks produced far more sustainable results. In a 2022 pilot involving 33 companies and over 900 workers, organisations reduced working hours from 40 to 32 hours while maintaining full salaries. 

The outcomes were striking: 

• Over 90% of participating companies retained the policy 

• Employee well-being improved significantly 

• Sick days dropped by nearly two-thirds 

• Revenue remained stable or increased 

The difference lies in the degree of compression. 

A four-day work week requires organisations to achieve roughly 20% efficiency gains. A true 4-hour workday requires workers to produce the same output in half the time, which demands dramatically higher sustained intensity. 

Companies in successful four-day trials also redesigned workflows by: 

• Reducing unnecessary meetings 

• adopting asynchronous communication 

• eliminating redundant processes 

• prioritising focused work periods 

In contrast, shorter daily schedules often relied on employees simply working faster without structural changes. 

Comparing the different models

The comparison shows that moderate reductions in working time are easier to sustain than extreme daily compression. 

The quiet retreat from failed trials

Many organisations that tested variations of the 4-hour workday did not publicly discuss the outcomes. In most cases, policies were gradually modified rather than formally cancelled. Reduced schedules might become seasonal perks, temporary pilots, or department-specific initiatives. 

This quiet retreat often reflects organisational realities. Admitting that a widely promoted experiment failed can undermine leadership decisions or public narratives about productivity innovation. As a result, some of the most visible examples of the 4-hour workday concept continued to circulate in media coverage even after companies had already adjusted the model internally. 

Lessons from the experiments 

By 2024, more than 245 organisations globally had tested four-day workweeks. Research led by Boston College economist Juliet Schor found consistent benefits when working hours were reduced alongside operational redesign. The key lesson from these experiments is that successful models remove unnecessary work rather than compressing existing workloads. 

Shorter meetings, streamlined communication, and clearer priorities make productivity gains possible. Simply demanding faster output rarely produces sustainable results. For many organisations, the promise of a 4-hour workday remains more aspirational than practical. 

Distilled 

Experiments around the 4-hour workday reveal a consistent pattern. Radical compression of daily work hours often creates operational strain rather than efficiency gains. The most extreme model, five-hour workdays, struggled to sustain productivity and collaboration. Tower Paddle Boards lost nearly half its workforce during the initial trial and later replaced the policy with seasonal reduced hours. 

Six-hour shifts improved well-being but required additional staffing in sectors that depend on continuous coverage. Four-day workweeks proved far more sustainable. By reducing weekly hours moderately and redesigning workflows, organisations achieved productivity gains without dramatically increasing work intensity. 

For IT leaders and operational teams, the lesson is clear: productivity improvements come from redesigning work, not simply compressing time. The 4-hour workday remains an intriguing idea. The experiments that came closest to it show how difficult it is to implement without fundamental changes to how organisations operate.