The lights are still on at 8 p.m., and the manager reads that as commitment. The research says it is often the opposite. Here is what the evidence shows, what is different in Nigeria and how to run a team on results, not hours.

Last updated: 27 October 2026

In many Nigerian offices, the first person in and the last person out is assumed to be the most dedicated. Staying late is read as loyalty, and leaving at closing time is read as a lack of ambition. Add a commute that can swallow hours of the day, and a ten-hour office shift can mean a thirteen-hour working life.

This guide argues that the assumption is wrong for most jobs. It draws on international research on hours and output, health evidence from the World Health Organization, and Nigerian surveys and reporting on stress, commuting and overwork. It is written for employers, HR teams and recruiters who want teams that perform, not teams that merely look busy.

A Few Notes Before We Start

The evidence has limits, and we flag them. The best-known study on hours and output uses data from British munitions workers a century ago, so it cannot be applied to every modern job without care. The four-day-week trials we cite involved employers who chose to take part. The Nigerian evidence consists mainly of surveys run by wellness and health-technology firms, small academic studies and press reporting, and we found no national dataset linking hours worked to output in Nigeria. Jobs also differ: a shift worker on a production line and a software developer do not respond to long hours in the same way. And the point is not that effort does not matter. It is that more hours stop buying more output well before most people think they do.

What the Research Says About Hours and Output

Output per hour falls, and then the extra hours buy almost nothing

Stanford economist John Pencavel studied British munitions workers and published his findings in The Economic Journal in 2015. As summarised by HR Reporter, output varied in proportion to hours for people working fewer than about 49 hours a week, then began to decline after 50 hours, and the extra hours added almost nothing by around 63 hours. Other summaries, such as this one from Silicon Canals, describe the finding as a sharp drop in hourly productivity past 50 hours, with 70 hours producing little more than 55.

The caveat is real. A commentary on the study points out that munitions work is not office work, and that in creative or knowledge jobs, some people achieve more in a focused hour than others do in a day. The curve may differ by job. The general pattern, that output does not rise in a straight line with hours, appears across many studies.

Long hours damage health

The WHO and the International Labour Organization published the first global analysis of long working hours in 2021. They estimated that 745,000 people died from stroke and ischaemic heart disease in 2016 because of working at least 55 hours a week, and the risk was about 35 percent higher for stroke and 17 percent higher for heart disease death compared with a 35 to 40 hour week. The agencies also said that about 9 percent of the world’s population was working long hours. ICIR carried the findings for a Nigerian audience. These are global estimates and they do not give a Nigerian figure, but sick, exhausted staff are not productive.

Shorter weeks have not reduced results in trials

The largest four-day-week trial to date ran in the UK from June to December 2022 with 61 companies and about 2,900 employees. According to the published report, 56 of the 61 companies kept the four-day week afterwards, and 18 made it permanent. A summary at 4dayweek.io reports that 71 percent of staff said burnout fell, staff turnover dropped by 57 percent and revenue was broadly stable. The trial was run by advocacy groups with university researchers, and the firms volunteered, so it shows what is possible, not what every employer will get. We found no comparable Nigerian trial.

The Nigerian Context

The law leaves hours largely to contracts

The Labour Act does not set a general maximum for daily or weekly hours or an overtime rate. WageIndicator says hours and overtime are matters of mutual agreement, collective bargaining or wages boards, and that a 40-hour week is the usual full-time standard. A Techpoint explainer on overtime describes a content marketer who is expected to work 40 hours but averages 48 to 50 without overtime pay, and reads the Labour Act as setting 40 hours as the standard. Legal guides differ on this point, so take advice for your own contracts. Either way, the practical result is that your own policy and culture decide how long people work.

The commute is part of the working day

The working day does not start at the office door. The Danne Institute of Research found, as reported by BusinessDay, that Lagos workers spent an average of 2.21 hours in traffic daily. That figure is older, but fuel prices have since made it harder: BusinessDay reported in March 2026 that petrol had passed ₦1,200 a litre and that firms in finance, insurance and hospitality were moving toward board-approved hybrid models and staff busing. Meanwhile, the Intelpoint and AltSchool Africa survey found that 14.46 percent of respondents spent 30 percent or more of their income on commuting. An employee who works late and commutes for hours has little left to recover.

Stress and burnout are widespread

Several Nigerian surveys point the same way, though most are from wellness or research organisations and use different methods:

Those are not output measurements, but they describe a workforce that is stretched. A team in that condition can work long hours and still deliver less.

Hustle, second jobs and tired staff

Many Nigerians work long hours because they need the money. Techeconomy describes the side-hustle boom as a response to economic pressure that can leave workers exhausted and erode performance in their main jobs. A study of 200 moonlighting employees in Lagos, published by University of Johannesburg researchers, found that second jobs were a coping strategy for low earnings and had negative effects on health, family time and performance in the main job. For employers, that is one more reason that fair pay matters: staff who can live on one income have more energy for the job they are paid to do.

Long hours also push people out. A study on prolonged work hours among Nigerian healthcare workers, published in Population Medicine, examines how excessive hours influence their intentions to migrate. The same logic applies to employers in other sectors: overwork is a reason people start looking elsewhere, as we describe in Why Good Employees Quit Good Companies.

Why Employers Keep Rewarding Long Hours

  • Hours are easy to see and results are not. A full office at 7 p.m. looks like effort. Output takes more work to measure.
  • Cheap labour hides the cost. When overtime is unpaid and staff cannot easily leave, the cost of long hours appears later as turnover and errors.
  • Managers copy what was done to them. Many were promoted for staying late, and nobody taught them to manage for results. See Managers Should Be Trained Before Managing People.
  • Fear of looking uncommitted. Staff stay late because they believe leaving on time will be held against them.

What to Do Instead

  1. Define what good output looks like for each role. Write down two or three results per role per month. If you cannot describe the output, you cannot manage it.
  2. Set a normal week and treat overtime as an exception. Respect the 40-hour norm, agree overtime in advance and pay for it as your contracts provide.
  3. Audit the waste. Count recurring meetings, status reports and interruptions. A Silicon Canals summary cites research that regaining full focus after an interruption takes about 23 minutes on average, so a fractured day produces less than its length suggests.
  4. Fix the commute problem where you can. Offer hybrid days, staggered start times or staff transport. BusinessDay’s reporting shows Nigerian firms are already moving this way.
  5. Pay a wage people can live on. It reduces moonlighting and the exhaustion that comes with it.
  6. Train managers to manage output. One-to-one conversations, clear priorities and honest feedback do more than watching the clock.
  7. Protect rest. Avoid expecting replies at night and on weekends unless the job truly requires it.
  8. Run a small experiment. Try flexible hours or a compressed week with one team for a few months, measure results and compare. The UK trial suggests it can work, but your sector and infrastructure may differ.
  9. Watch the warning signs. Rising sick leave, errors, resignations and missed deadlines are signs that hours are too long.
  10. Ask your staff. A short anonymous survey on workload, commute and energy will tell you more than a headcount at 7 p.m.

What Recruiters Can Do

  • Read job adverts for warning phrases. Requirements such as flexible hours, willing to work weekends or must be available at all times, with no pay or overtime terms, deserve a conversation with the client.
  • Ask clients about real hours. Find out what time people actually leave and what the commute looks like. Candidates will ask.
  • Be honest with candidates. Misleading advertising about hours produces early exits, as we explain in Why Your Recruitment Process Is Chasing Away Top Talent.
  • Present reasonable hours as an employer advantage. In a market where many companies overwork people, a sane schedule is a selling point. See What Is Employer Branding, and Why Should a Nigerian SME Care?

Frequently Asked Questions

Do longer hours ever increase output? Yes, up to a point. In Pencavel’s study, output rose roughly in line with hours at lower weekly totals and then flattened and fell. Short bursts of extra effort, such as a deadline week, are different from a permanent long-hours culture.

How many hours is too many? The WHO treats 55 hours or more a week as a serious health hazard, and Pencavel’s data shows hourly output falling after about 50. Individual jobs and people vary, so use these as warning thresholds, not exact rules.

Is there a legal limit on hours in Nigeria? Sources differ. WageIndicator says the Labour Act leaves hours and overtime to agreement, while other guides refer to a 40-hour standard. Get legal advice on your own contracts.

Should we pay overtime? Your employment contract and any collective agreement govern this, and fairness points toward paying for agreed extra hours. Unpaid overtime is a hidden cost that often returns as turnover.

Will a four-day week work in Nigeria? We found no Nigerian trial. The UK results are encouraging but come from volunteer employers, and power, transport and client expectations may differ here. Test it with one team first.

How do we measure productivity without counting hours? Agree outputs per role, such as projects completed, sales closed or tickets resolved, and track them alongside quality and customer feedback.

The Bottom Line

A long day is not proof of a good day. The evidence shows that output per hour falls once weeks stretch past about 50 hours, that very long weeks harm health, and that Nigerian workers already carry heavy loads of stress, commuting and cost-of-living pressure. Employers who measure results, respect a normal week and fix the avoidable waste will usually get more from fewer hours and keep their best people longer. When you are ready to hire, you can post a job on MyJobAlly and set out hours, pay and expectations honestly from the start.

This article draws on the World Health Organization and ILO, John Pencavel’s research as summarised by HR Reporter and Silicon Canals, the UK four-day-week pilot report and 4dayweek.io, WageIndicator, Techpoint Africa, BusinessDay, The Guardian Nigeria, ICIR, Dataphyte, Intelpoint and AltSchool Africa, Techeconomy, the University of Johannesburg and Population Medicine, current as of October 2026. Several sources are press summaries, wellness-company surveys and campaign-linked trials, and may use different methods. The Pencavel data comes from British munitions workers, the four-day-week employers volunteered and the Danne Institute commute figure is older. We found no national Nigerian dataset linking hours worked to output, and no Nigerian four-day-week trial. Legal points on hours and overtime should be confirmed with a lawyer. This article is general information, not legal, medical or HR advice.