The Toronto pilot for a four-day week, conducted over a recent period, produces results that deserve careful examination. Productivity progresses notably and turnover declines meaningfully, according to an evaluation published on this pilot. But employees’ self-reported well-being stagnates, sometimes declining in certain cohorts, and meetings and deliverables have not decreased significantly. Compare these figures with the British pilot of 2022-2023, which had explicitly reorganized work intensity at the same time as the schedule: improved well-being, 92% of participating companies maintained the arrangement.
The Essential Points
- Compressing time without changing workload produces productivity gains but changes little, or almost nothing, in employee well-being.
- The Toronto pilot records a notable productivity increase and a meaningful drop in turnover, but self-reported well-being remains stable or declines slightly in certain cohorts, due to the lack of reduction in meetings and deliverables (4-Day Week Global).
- The British pilot (2022-2023), led by 4-Day Week Global and Cambridge University, explicitly reorganized work intensity: as a result, improved well-being and a 92% continuation rate.
- The gap between the two experiments points to a precise mechanism: autonomy over how you work matters as much as work duration.
- The open question for the coming decade is whether organizations are ready to redistribute this autonomy, and on what conditions.
Toronto Compressed Time, Not Work
Twelve months. Around forty companies. Varied sectors, from consulting to services. The Toronto pilot had all the appearances of a serious experiment. And it was: the data produced by 4-Day Week Global are robust, the indicators numerous, the longitudinal follow-up real.
What the figures show on the surface seems reassuring. Notable productivity increases are far from negligible. A meaningful drop in turnover is no less so: the cost of replacing an employee generally ranges between 50 and 200% of their annual salary depending on the sector, so this variable alone can financially justify the shift to four days for an employer. Participating managers overall expressed high satisfaction. On these metrics, the experiment is a success.
But employees’ self-reported well-being tells a different story. Stable, sometimes slightly negative depending on the cohorts, it does not improve. Yet this is precisely what the four-day week is supposed to produce as a priority: a less exhausting life, a less harmful relationship with work. The reason appears in the operational data: neither the number of meetings nor the volume of deliverables decreased significantly. The same tasks, the same solicitations, compressed into four days instead of five.
The result looks less like liberation than compression.
The British Approach
The British pilot of 2022-2023, conducted with academic support from Cambridge University, covered 61 companies and approximately 2,900 employees. Its fundamental difference from Toronto lies in a starting hypothesis: work duration is only the surface variable. What conditions well-being is the concrete organization of work, the density of interactions, the ability to decide alone how to manage one’s time, the reduction of non-essential interruptions.
Participating companies in the British pilot conducted, before reducing the calendar, an explicit internal diagnostic. They identified the meetings that were truly necessary, lightened or eliminated certain deliverables, and measured the share of administrative tasks without productive value. The shift to four days only happened after this preliminary work.
The results then diverge sharply. Self-reported well-being improves in a measurable way. Burnout declines. And most importantly, 92% of participating companies chose to maintain the arrangement at the end of the pilot, which constitutes, in terms of social and organizational experimentation, a strong signal. An employer does not maintain a costly change to implement if the real effects do not justify it.
The two experiments answered distinct questions. Toronto addressed hourly volume; the United Kingdom addressed the organization of work itself. These two dimensions are independent of each other.
Iceland Pioneered the Way as Early as 2019
It would be reductive to treat the Toronto-UK contrast as a surprise. Iceland conducted between 2015 and 2019 one of the best-documented experiments in working time reduction, under the aegis of the Icelandic government and the Reykjavik City Council, with union participation (notably the BSRB). The Autonomy Institute (United Kingdom) and the Icelandic organization Alda analyzed and published the results afterward. The results had already outlined what would be confirmed: working time reduction improves well-being when accompanied by a restructuring of practices, not when it merely removes a day from the calendar.
The Icelandic evaluation highlighted the role of procedural autonomy: the freedom given to workers to determine for themselves how to organize their time, which tasks to delegate and which meetings to avoid. Sectors where this autonomy was greater reportedly recorded larger well-being gains. The employee who chooses how to fill their four days fares better than one from whom a fifth day has been removed without changing anything else.
The OECD, in its job quality index, has measured this dimension for several years. Autonomy in work organization figures there as one of the most solid predictors of job satisfaction, ahead of salary level in certain income brackets. This counter-intuitive result took time to establish itself in the managerial debate, but it now emerges in comparative data.
Productivity Without Well-Being: A Risky Bet for Employers
It is tempting for an executive to read the Toronto figures and draw a pragmatic conclusion: the four-day week improves productivity and reduces turnover, and that is sufficient. The argument has logic. But it overlooks a dynamic that medium-term data tend to confirm.
An employee whose well-being stagnates in a more compressed work framework can produce more in the short term, the effect of constraint, the additional pressure exerted by reduced time. But this dynamic reverses. Studies on professional exhaustion, whose works by Christina Maslach on burnout have been reference literature since the 1980s, show that compression without relief from cognitive load is a predictable precursor to delayed disengagement. The employee who performs better over twelve months may become one who stops, quits, or becomes less invested over twenty-four.
The meaningful drop in turnover is a real gain. But if the model does not address root causes—cognitive overload, meeting addiction, redundant deliverables—the question is whether this gain withstands a horizon of three to five years. Data from the Toronto pilot do not yet allow answering this question. The duration of twelve months is sufficient to measure immediate effects, insufficient to observe wear-out dynamics.
In this regard, it is useful to recall that transformations linked to AI and automation add another layer to this equation: workers facing simultaneously time compression and the reconfiguration of their tasks by digital tools bear a double cognitive load. The four-day week without reorganization risks then functioning as a painkiller applied to structural pain.
Organizational Changes Prior to Calendar Reduction
Companies in the British pilot that achieved the best results share several documented characteristics. They began by mapping their actual workflow, not their organizational charts. They identified decision-less meetings, often 30 to 40% of the total according to internal audits, and eliminated them or converted them to asynchronous communications. They reduced deliverables to what produces real value for the client or organization. And they gave teams real latitude over how to distribute their time.
The program is simple to formulate but difficult to execute, as it touches on habits and internal power relationships. The omnipresent meeting is often the means by which managers exercise visible control over their teams. Reducing it requires trusting them differently. It is a cultural change as much as an operational one.
This cultural dimension is precisely what major surveys on job quality have pointed to for a decade. The OECD notes that countries where workers report the strongest procedural autonomy—Nordic countries leading, the Netherlands, to a lesser extent the United Kingdom—also register the highest levels of job satisfaction, without legal working durations necessarily being the lowest. Duration is one variable among others. Work organization is the structuring variable.
The Coming Decade Will Settle the Question of Autonomy
The Toronto experience clarifies the conditions for the four-day week to be effective without invalidating its principle. For the period 2026-2030, the documented question is to what extent organizations, public or private, are ready to redistribute autonomy over work organization, the established condition for any real well-being gain.
Two trajectories emerge from available data. In the first, working time reduction remains a calendar reform: one removes a day, one keeps the workload, one cashes in on short-term productivity gains. This model will appeal to employers seeking a competitive advantage in recruitment; a drop in turnover and rising employer attractiveness are real arguments in a tight labor market. But it does not transform the subjective experience of work, and its benefits could erode as the arrangement becomes commonplace.
In the trajectory supported by the British and Icelandic results, working time reduction serves as leverage for deeper reorganization. Companies that take this path rethink the concrete nature of work: which interactions are necessary, which deliverables have value. This transformation is more demanding, but the data indicate that it alone produces lasting effects on well-being.
The most instructive signal to distinguish between these trajectories in the coming years will probably not be the number of companies adopting the four-day week, that figure will increase mechanically, driven by competition in recruitment. It will be the continuation rate at three years, and the correlation between this rate and the depth of the initial reorganization. If companies that have restructured their practices maintain the arrangement at a significantly higher rate than those that have merely removed a day, the argument becomes difficult to contest.
The Autonomy Institute is tracking these indicators in Iceland. 4-Day Week Global is progressively building a comparative database. We will probably need to wait until 2027 or 2028 to have cohorts large and long enough to settle this empirically. In the meantime, available data point in a clear direction: reducing hours without redistributing autonomy is changing working conditions without changing work.
Sources
- 4-Day Week Global, Research & Pilots
- Cambridge University / 4-Day Week Global, The results are in: the UK’s four-day week pilot (2023)
- Autonomy Institute, Iceland’s four-day week trials: Research and results (evaluation 2019-2023)
- OECD, OECD Employment Outlook, editions 2022-2024, Job Quality Index
