Duration is a working condition
A working day can be extended by overtime, availability, meetings or tasks completed outside planned hours. Risk depends on more than the total: what is done, when and with how much opportunity to recover all matter.
HSE links the combination of long hours, demands and insufficient recovery with fatigue. WHO and ILO have studied the effects of prolonged exposure to long working weeks. This evidence guides prevention, but does not establish a universal limit guaranteeing safety for every activity.
Review actual time, not just the schedule
Compare plans with actual work and last-minute changes. Look for accumulation by person, team and successive periods, including on-call duty and interventions where appropriate. An average can conceal several particularly demanding consecutive days.
Define clear criteria for recording and reviewing information. The preventive objective is to recognise patterns and correct conditions, rather than make each person wholly responsible for a workload assigned by the organisation. Also check for invisible tasks or unrecorded expectations of availability.
Connect schedules with task demands
Analyse physical effort, sustained attention, monotony, critical decisions and environmental conditions. The same duration can produce different demands in administrative work and an intervention involving hazardous energy.
Identify operations that should not be concentrated at the end of already extended days without a specific review. Consider subsequent travel and handovers. The article on breaks addresses recovery during work; the concern here is preventing organisational patterns that create accumulation which breaks cannot compensate for.
Plan resources and rules for extending hours
Establish how extensions are authorised, what alternatives exist and when an activity is reorganised or stopped. Plan relief, absence cover and responses to demand peaks. If exceptions become constant, review available capacity.
Consult workers and representatives about actual difficulties. An individual preference for a schedule does not remove a risk requiring assessment. Check limits and rest under Spain’s Workers’ Statute, the collective agreement and applicable sector rules; do not transfer figures from another country or activity.
Check that measures work
Review accumulated hours, unexpected changes, usable rest periods and situations where work continues despite fatigue. Compare records with observation and conversation while protecting personal information.
Improvements may include changing delivery schedules, distributing demand or increasing coverage. A campaign about better sleep does not correct planning that prevents rest. Evaluate the consequences of any change: reducing available time without adjusting workload can increase pace and create another preventive problem.
Hypothetical example: recurring month-end close
A team works several extended days in succession at every month-end close. Review shows that delays arise from receiving information late and that the most demanding checks are always left until the end.
Inputs are brought forward, reviews redistributed and support for problems defined. Actual hours and process errors are then compared. The intervention addresses work organisation instead of merely asking for more breaks within an unchanged workload.
