What 40 hours of overtime, “I only sleep,” daily drinks, and low energy reveal about ownership of time
“How much overtime do you do?”
“Usually more than 40 hours a month.”
When you hear that answer from two, three, then four people, your model of normal life starts to bend.
Does everyone work this much? Do people just love working?
The national data say no: 40–50 hours of monthly overtime is not the norm for everyone in Japan. But a social network concentrated in full-time employees, large firms, specialist jobs, IT, education, healthcare, transport, and service work can make heavy overtime look much more common than it is nationally.
More importantly, overtime is only one dimension.
One person can work 40 hours of overtime and still protect next month’s plans. Another can work only 10 hours of overtime but live under night shifts, weekend duties, on-call work, and last-minute schedule changes.
If you keep only one question for evaluating a job’s effect on life, make it this:
Can you commit to a Saturday one month from now, on your own authority?
0. The 30-second version: the problem is not just being busy
A useful, non-academic shorthand is:
Work-life contamination ≈ hours worked × invasion of social time × unpredictability ÷ schedule control
This is not a validated scientific index. It is a way to organize the evidence.
- Hours worked: how much time the job consumes
- Invasion of social time: whether nights and weekends are taken
- Unpredictability: how late schedules are finalized and how often they change
- Schedule control: whether the worker can refuse, swap, move, or protect time
Forty hours of overtime is substantial. But forty predictable hours are different from living every week with “I don’t know whether Saturday is mine.”
1. “Everyone does 40 hours” is not the national baseline
A Japanese Ministry of Health, Labour and Welfare worker survey reported that, for average monthly overtime in April–June 2024, 91.7% were at 45 hours or less, 5.2% were above 45 and up to 60, and 1.2% were above 60 and up to 80.[1]
An important limitation:
The table uses a 45-hour threshold. It does not tell us exactly how many people work more than 40 hours.
So it cannot directly answer “what percentage exceed 40?” Still, it makes it hard to claim that exceeding 45 hours every month is simply normal for everyone.
The same ministry’s review also found a modest tendency for larger establishments to report somewhat longer average and maximum overtime, and a slightly higher share over 45 hours, although the relationship weakened among the most extreme overtime groups.[2]
So “large company” does not automatically mean short hours or long hours.
A friend group concentrated in large firms and demanding professional roles can easily become a 40-hour-overtime club without representing the country.
2. Forty hours a month is roughly two extra hours every workday
With 20 workdays, 40 hours of overtime averages about two hours per day.
A 9-to-6 job becomes roughly a 9-to-8 job.
Then come commuting, dinner, showering, housework, and sleep.
Weekdays can collapse into:
work → basic maintenance → sleep
At that point, “no hobbies,” “no dating,” or “I only sleep on days off” cannot be explained purely by motivation.
Disposable time and disposable energy have both been reduced.
3. Unpredictability can hurt more than the raw total
A JILPT survey of 9,930 non-regular workers found 45.8% had fixed days and hours. Two forms of schedule-based work accounted for 29.2% and 17.4%, while 3.5% were contacted on the previous day or same day to ask whether they could work.[3]
This is a survey of non-regular workers, not the entire Japanese workforce.
But it demonstrates that delayed schedule determination is a real labor condition.
The Working Time Society consensus identifies long hours, shift work, irregular and unpredictable hours, evening work, and weekend work as important risks for poorer work-life balance because they invade time that has unusually high value for family, friends, leisure, and social participation.[4]
A Korean national working-conditions study of 31,859 workers found unpredictable schedules were associated with substantially higher work-family conflict even after adjusting for weekly hours, shift work, occupation, company size, and other factors; the reported odds ratio was 3.71.[5]
That was cross-sectional and Korean, so it does not prove causation or directly quantify Japan.
The practical lesson is still useful:
Control over future time matters in addition to the number of hours worked.
4. The one-month Saturday test
Instead of judging by job title, ask:
- Can the person commit to a day off one month ahead?
- How often does work cancel an already confirmed plan?
- If plans change, how much notice do they get?
- Can they say “I’m unavailable that day” to urgent requests?
- Do they have enough slack to propose another date?
This matters for dating, friendship, travel, family, healthcare, hobbies, and learning.
Ten overtime hours with a weekly schedule lottery can be hard to build a life around. Forty overtime hours with protected weekends and predictable peaks may still be designable.
Time quantity and time ownership are different variables.
5. Why people do not simply refuse
It is easy to see someone doing 40 hours of overtime and say, “You must love working.”
That erases the organization.
Refusal can be costly when:
- there is no replacement
- one person holds critical knowledge
- incidents, deadlines, and clients arrive unexpectedly
- everyone else is still working
- evaluations or promotion feel at risk
- people do not want to burden coworkers
- capable workers attract even more work
In IT and large projects, releases, incidents, migrations, and deadlines can create temporary load spikes. But an individual’s overtime should not be tied to a specific public system failure without evidence.
Sometimes the issue is not unwillingness to refuse.
The price of refusal is high.
6. When evenings become “sleep, drink, no energy”
Then comes the second-order effect.
You get home exhausted. There is no energy left for anything. You drink. You get sleepy. You sleep. You still do not feel restored.
Alcohol can look like an off switch without functioning as a charger.
A 2025 systematic review and meta-analysis of 27 studies in healthy adults found that even low doses of alcohol reduced REM sleep, with disruption worsening as dose increased. High doses could shorten sleep onset in some studies, while worsening later REM disruption.[6]
This does not mean that drinking every day automatically equals a diagnosis.
The point is structural: if work reduces recovery and the recovery strategy itself can disrupt sleep, free time can shrink even further.
Life becomes a four-panel comic:
work → drink → sleep → work
7. Is lack of dating all caused by work? No.
Research supports the idea that work can crowd out social life. It does not support “being single means work caused it.”
Japan’s 17th National Fertility Survey, released in 2026, reported that among unmarried people aged 25 and older who intended to marry, “not having met a suitable partner” remained the most common reason for being single. At the same time, roughly one in three unmarried respondents did not want a romantic relationship.[7]
Dating outcomes also depend on preferences, motivation, geography, money, social networks, and online matching.
But if a job:
- consumes evenings and weekends
- breaks plans at short notice
- leaves the person exhausted when they do meet someone
- removes the energy needed to meet new people
then the conditions for starting and maintaining relationships deteriorate.
The better question is not “Is this occupation bad for dating?”
It is:
Can this person create a plan, protect it, and reschedule when life happens?
8. Long-term benefits and costs
Long hours can bring real benefits:
overtime pay, concentrated experience, learning from large projects, a sense of mission, valuable skills, or convenient weekday time off in some shift systems.
The question is whether those benefits are chosen and compensated.
Unpredictability itself is harder to defend as a benefit.
A 2026 meta-analysis of 52 longitudinal studies with 112,714 participants found work-to-family conflict was associated with later depressive symptoms, burnout, and general psychological distress, with modest effect sizes after adjustment. The included evidence was observational, so causality is not fully established.[8]
WHO/ILO analyses have also reported higher long-term risks of ischemic heart disease and stroke among people working at least 55 hours per week compared with 35–40 hours.[9]
A Japanese company study using recorded work schedules found weekend work among white-collar employees was associated with worse mental health and suggested an hour of weekend work could carry a larger mental-health cost than an hour of weekday overtime.[10]
An hour of work does not have the same price at every point on the clock.
9. How to avoid the trap: ask better questions than “How much overtime?”
When evaluating a job or team, ask about:
- actual overtime in the last three months
- when next month’s schedule becomes final
- how often finalized schedules change
- annual weekend-work frequency
- expectations for night and weekend messages
- backup coverage for incidents and absences
- freedom to request or swap days off
- how much work depends on one person
- whether people are truly left alone on paid leave
- whether peak periods are predictable
Do not over-index on occupation labels.
Two nurses can have entirely different lives. Two IT engineers can have entirely different on-call burdens. Two departments in the same large company can have opposite work cultures.
The real question is:
Who controls the calendar?
10. Conclusion: free time is not just empty time; it is time you can reserve
Forty monthly overtime hours, across 20 workdays, take roughly two additional hours from each weekday.
But what often damages life more is adding:
“Can you come in tomorrow?” “I still don’t know about Saturday.” “If we don’t finish, I’ll work this weekend.” “Make plans if you want, but they might disappear.”
So the final question is not only about overtime.
Can you commit to a Saturday one month from now, on your own authority?
If yes, life can still be designed around a demanding job.
If no, the employer may effectively hold reservation rights over future time that supposedly belongs to the worker.
That can be funny enough to trigger the joke, “People really love working.”
After the joke, look at the real variable:
ownership of time.
References (12)
- https://www.mhlw.go.jp/content/11201250/001462595.pdf mhlw.go.jp
- https://www.mhlw.go.jp/stf/newpage_57784.html mhlw.go.jp
- https://www.jil.go.jp/institute/research/2023/227.html jil.go.jp
- https://doi.org/10.2486/indhealth.SW-4 doi.org
- https://pubmed.ncbi.nlm.nih.gov/38148922/ pubmed.ncbi.nlm.nih.gov
- https://pubmed.ncbi.nlm.nih.gov/39631226/ pubmed.ncbi.nlm.nih.gov
- https://www.ipss.go.jp/ps-doukou/j/doukou17/doukou17_gaiyo.html ipss.go.jp
- https://doi.org/10.1371/journal.pmed.1005162 doi.org
- https://www.who.int/news/item/17-05-2021-long-working-hours-increasing-deaths-from-heart-disease-and-stroke-who-ilo who.int
- https://doi.org/10.1016/j.socscimed.2019.112774 doi.org
- https://pubmed.ncbi.nlm.nih.gov/25349460/ pubmed.ncbi.nlm.nih.gov
- https://www.mhlw.go.jp/toukei/itiran/roudou/monthly/r07/25fr/dl/pdf25fr.pdf mhlw.go.jp
