How does a shorter working week affect productivity and pay?

Numbers match the citations in the article. A working link isn't proof that a page supports a claim; check the quoted passage and date.

1. 1

   The Four Day Week: Assessing global trials of reduced work time with no reduction in pay: Evidence from Ireland

   Research Repository UCD (University College Dublin) (Kelly et al.)Published Nov 30, 2022Checked Oct 15, 2026

   “Boston College leads the research team in partnership with University College Dublin, Cambridge University and other academic partners. We are constructing a sizeable quantitative database of employee outcomes across different countries and types of companies and organisations. We collected data on time use, subjective wellbeing, physical and mental health, labour market behaviour, and energy use with a wide-ranging instrument. In February 2022, 4DWG launched the first of several coordinated international trials. It involved 614 employees across Ireland, the United States, Australia, and New Zealand. The research involved (i) surveying employees at the beginning, midpoint and end of the trial, (ii) compiling time-use diaries of employees’ days off, (iii) collecting monthly data on organisational performance and (iv) interviewing employees and managers at the end of the trial1. This report presents detailed results of a subset of Irish organisations and their employees participating in the trial. This group comprised 12 small to medium enterprises, primarily concentrated in the IT and professional services sectors.”

2. 2

   Assessing the Operational and Psychosocial Impact of the Compressed Workweek: A Meta-Analytic Review of Four-Day Work Week Trials Across Industries

   Global Multidisciplinary Perspectives Journal (Oparah et al.)Published Jan 1, 2024Checked Oct 15, 2026

   “This meta-analytic review synthesizes empirical findings from diverse industries to assess both the operational efficiency and psychosocial outcomes associated with this evolving work structure. Drawing from over 50 trial implementations across sectors such as healthcare, technology, education, and public administration, the paper evaluates the impact of reduced work hours on productivity, employee well-being, organizational commitment, and customer satisfaction. Quantitative outcomes are analyzed alongside qualitative evidence to explore industry-specific dynamics, cultural adaptations, and managerial concerns. The review highlights key moderators, including sectoral norms, job autonomy, and implementation models, that influence the success or failure of compressed workweeks. The findings provide comprehensive insights for policymakers, organizational leaders, and HR practitioners considering the transition to alternative scheduling frameworks aimed at fostering work-life balance and sustainable performance.”

3. 3

   The promise of a four-day week? A critical appraisal of a management-led initiative

   Employee Relations (Delaney & Casey)Published Aug 7, 2021Checked Oct 15, 2026

   “Our study finds that the promise of a four-day week attracted employee favour and individualised benefits. However, entrenched managerialist practices of performance measurement, monitoring and productivity pressures were intensified. Pro-social and collective interests evident in labour-led campaigns were absent. We urge greater critical scrutiny into seemingly advantageous “business case” initiatives for reduced work hours. Originality/value Little is known about what happens to concern for social and employee interests entailed in reduced working hours initiatives when a management-led initiative is implemented. Indeed, the majority of research focuses on the macro-level rather than interrogating the “black box” of firms. Our inquiry contributes to these debates by asking, how does a management-led RWH initiative affect employees?”

4. 4

   Working Hours and Productivity

   RePEc: Research Papers in Economics (Collewet & Sauermann)Published May 1, 2017Checked Oct 15, 2026

   “This paper studies the link between working hours and productivity using daily information on working hours and performance of a sample of call centre agents. We exploit variation in the number of hours worked by the same employee across days and weeks due to central scheduling, enabling us to estimate the eect of working hours on productivity. We nd that as the number of hours worked increases, the average handling time for a call increases, meaning that agents become less productive. This result suggests that fatigue can play an important role, even in jobs with mostly part-time workers.”

5. 5

   On the Fifth Day:Autonomy, Organizational Control and the Ownership of Time in the Four-Day-Work-Week

   University of Birmingham Research Portal (University of Birmingham) (Daniel et al.)Published Sep 8, 2025Checked Oct 15, 2026

   “th stakeholders at 20 UK SMEs in 2024, this study examines an important unanswered question: how is the “fifth day” utilized, and does its use matter for individual and organizational outcomes? Applying longstanding debates around autonomy and organizational control to the four-day week, we explore how employer concerns about moonlighting and malfeasance come into tension with employee preferences for control over their time and freedom to pursue activities that support career development, work–life balance, and well-being. We find a wide range of uses for the fifth day, from leisure time that enhances work recovery, to easing caring responsibilities, to education and training for personal and professional development, to civic engagement (whether employer-linked or not), and, more controversially, side hustles. The impacts are equally diverse, reflecting individual and organizational nuances and a mix of benefits, challenges, and risks. We conclude by outlining agendas for future research to inform policy and provide practical guidance on the ownership of the fifth day, and on the autonomy–control balance as critical factors shaping the long-term success of the four-day work week.”

6. 6

   Shaping Public Sector Transformation:The Promise of a Four-Day Working Week

   The UWS Academic Portal (University of the West of Scotland) (0000-0001-8470-6251 & Jodie)Published Nov 30, 2024Checked Oct 15, 2026

   “However, the complexity of measuring productivity in the public sector, where intangible factors such as workplace culture play a significant role, remains a challenge. Another focal point of the paper is the role of strategic adaptations, such as job crafting and the integration of Artificial Intelligence (AI), in facilitating a successful transition to a 4DWW. AI has the potential to automate repetitive tasks, freeing up valuable time for employees to focus on more meaningful work. While early trials of the 4DWW have shown positive outcomes in both private and public sectors, the findings suggest that public sector organisations will need to make cultural shifts and embrace technology to fully realise the benefits. The paper concludes by identifying areas for further research, including the long-term impact of the 4DWW on public sector productivity, the role of organisational culture in the successful adoption of reduced working hours, and how AI can be effectively leveraged to support this transition. These areas are critical for addressing the unique challenges faced by the UK's public sector as it seeks to adopt more sustainable and innovative work practices.”