Working 12 hours a day in France raises a specific question: at what threshold does the Labor Code prohibit this practice, and in what cases does it allow it nonetheless? The maximum daily working time is set at 10 hours per day for an adult employee in the private sector. Exceeding this limit requires meeting strict derogatory conditions, governed by collective agreement or administrative authorization.
Legal limits on working time: compared thresholds
Before examining the exceptions, a table allows us to locate the limits that the Labor Code imposes by default and those that may apply under certain conditions.
| Period | Legal reference duration | Maximum duration (general rule) | Maximum derogatory duration |
|---|---|---|---|
| Day | 7 h (based on 35 h/week) | 10 h | 12 h (collective agreement or DREETS authorization) |
| Week | 35 h | 48 h | 60 h (administrative authorization, exceptional circumstances) |
| Week (average over 12 weeks) | 35 h | 44 h | 46 h (collective agreement or administrative authorization) |
| Month (legal basis) | 151.67 h | – | – |
| Year | 1,607 h | – | Variable according to annualization agreements |
The shift from 10 to 12 hours per day is therefore not a simple tolerance. It requires an identifiable legal basis: branch collective agreement, company agreement, or express decision from the labor inspectorate (DREETS).
To delve deeper into the issue of the legality of working 12 hours a day, several cumulative criteria must be verified by the employer before any implementation.
Derogation to 12 hours a day: specific conditions and mechanisms
Two avenues allow for extending the daily working time to 12 hours of effective work.
Extended collective agreement or company agreement
A branch or company agreement may provide for exceeding the 10-hour limit, provided it specifies the reasons related to the organization of the activity. The sectors concerned are often those where the activity requires long hours: hospitality, health, surveillance, transportation.
The agreement must establish the compensatory measures (compensatory rest, increase) and respect the weekly limit of 48 hours, unless there is a separate derogation.
DREETS authorization
In the absence of a collective agreement, the employer can request administrative authorization from the DREETS. This request must be justified by a temporary increase in activity. The authorization is time-limited and subject to proportionality control.
In both cases, the burden of proof for compliance with maximum durations rests with the employer. A recent ruling from the social chamber confirmed this principle, reinforcing the obligation for traceability of hours.
Mandatory rest and breaks during a 12-hour day
Even when an employee works 12 hours, the rules on rest do not disappear. They apply cumulatively:
- Minimum 20-minute break as soon as the daily working time reaches 6 consecutive hours. For a 12-hour day, two breaks are therefore the norm in most agreements.
- 11 consecutive hours of daily rest between two working days, which reduces the maximum possible span to 13 hours (effective work plus breaks included).
- Weekly rest of 24 consecutive hours, to which the 11 hours of daily rest are added, resulting in a minimum of 35 hours of weekly rest.
An employee finishing at 10 PM cannot start again before 9 AM the next day. This mechanical calculation significantly limits the possibility of accumulating several 12-hour days in the same week without exceeding the weekly limits.
Sanctions faced by the employer in case of exceeding limits
Failure to comply with maximum daily or weekly durations exposes the company to criminal and civil penalties. The fine imposed is applied per affected employee and per observed violation, which can represent a significant cost for large organizations.
Beyond the fine, the employee may obtain damages before the labor tribunal if they demonstrate harm (impact on health, loss of rest). The employer cannot hide behind the employee’s consent: maximum durations are of public order, and the employee cannot validly waive them.
Case of the annualized hours
Employees on annualized hours are not subject to the 10-hour daily limit. However, they remain protected by the rules of daily rest (11 hours) and weekly rest (35 hours). The employer must ensure that the workload remains compatible with these rests, or risk having the annualized hours declared unenforceable by the courts.
Working 12 hours a day remains a legal exception, not a common arrangement. There is room for maneuver, but it requires a negotiated framework, formalized compensations, and rigorous monitoring of hours. Without a collective agreement or administrative authorization, the limit of 10 hours of effective work per day applies to all companies in the private sector.