IFATCA Policy is:

Rosters should be constructed following a simple pattern, with shifts of the same or very similar lengths and adequate breaks between shifts and shift cycles.

The average time of operational duty and breaks should not exceed 32 hours per week.

Each shift should not exceed 7 hours 30 minutes including breaks.

A safety risk assessment, considering the air traffic controllers fatigue, should be performed to verify any maximum hours that are exceeded beyond the recommended 7 hours and 30 minutes.

A minimum rest period of 11 consecutive hours per day should be provided.

Continuous operational duty for controllers should not exceed 2 hours. For controllers using a situation display (including in digital/remote towers), continuous operational duty should not exceed 90 minutes, after which a minimum 30 minute break, away from the working environment should be given to controllers.

Deviations from this policy shall only occur in exceptional circumstances and be accompanied by:
1. a written safety risk assessment that explicitly addresses, as a minimum, the risk of controller fatigue and the mitigation measures implemented; and
2. an investigation into the reasons why the maximum continuous operational duty limit was exceeded.

At least one break of a minimum of 1 hour duration, on both day and afternoon shift, shall be given to controllers for the purpose of eating at regular times and to prevent gastrointestinal dysfunctions.

Extra rest hours shall be provided when requested by a pregnant controller.

By night the total operational duty time should not exceed 5 hours.

Controllers shall not be held liable in the case of an accident or incident if the controller has previously registered a formal complaint to the relevant authority of exaggerated working hours or lack of fatigue management and these have been determined to be a contributing factor to the incident or accident.