thrive at work/Workload and capacity
Research finding · 06
Workload: a 54-day gap.
A sustainable workload is one of the clearest dividing lines in the data. It is decided by the employer, not the employee.
By Jerry Fiser, Founder & CEO · Reviewed by Marcin Bulik, Research Director · Updated November 8, 2026
How much does an unsustainable workload cost?
thrive research (2026) shows 54 working days a year per person separate employees with the least and the most sustainable workload, a quarter of the working year. Workload is one of three factors, with manager support and sleep, that each separate employees by about 50 days a year of not working effectively.
- 54 days a year between least and most sustainable workload.
- About a quarter of the working year.
- Workload is set by the employer.
- It is one of the three biggest dividing lines in the data.
The finding in plain numbers.
Employees who rated their workload least sustainable lost 54 more working days a year to exhaustion or stress than those who rated it most sustainable.
Why workload is a leadership measure.
The HSE Management Standards list demands among the six main causes of work-related stress, and Gallup on preventing burnout names unmanageable workload as a leading cause of burnout. Individuals cannot fix a workload they did not set. Read signs of overworking and causes of stress in the workplace.
What leaders can do.
Steps in order of impact.
- 1Plan to real capacity. Plan work against the people actually available.
- 2Cut low-value work. Cut low-value meetings and reports before adding work.
- 3Track around changes. Track capacity before and after major changes.
- 4Review quarterly. Make workload a standing item in quarterly planning.
What the numbers do and do not show.
These are associations between groups of employees, not proof of cause. Days of not working effectively are reported by employees themselves. The next studies test whether raising capacity changes outcomes and how scores line up with an employer's own absence and turnover records. Full methods are in the thrive at work white paper.
How to cite this finding.
thrive at work Research Division (2026). The Scientific Foundations of the thrive at work Framework: Methodology & Validation White Paper, first edition. Available at thriveatwork.ai/research/scientific-foundations.
thrive at work measures engagement (purpose, leadership, connection, growth) and capacity (energy, recovery, focus, resilience) in one anonymous assessment: see how the assessment works.
Most engagement problems show up first as falling energy, recovery and focus. thrive at work is a workforce performance platform: an employee engagement platform that also measures capacity to perform, so you can see strain by team before it turns into absence or resignations. Read more about employee capacity.
Sources.
- HSE Management Standards. www.hse.gov.uk
- Gallup on preventing burnout. www.gallup.com
- thrive index validation study. thrive at work, 2025–26. Methodology.
Common questions
How many days does an unsustainable workload cost?
Who controls workload?
See these numbers for your own teams.
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