In the UK, pilot work hours are strictly governed by the Civil Aviation Authority (CAA) to prevent fatigue. As of 2026, the Flying Time Limitations (FTL) generally restrict pilots to a maximum of 900 flying hours in a calendar year and no more than 100 flying hours in any 28 consecutive days. Beyond actual time in the air, "Duty Period"—which includes pre-flight briefings, ground duties, and post-flight admin—is also capped. A single flight duty period typically ranges from 9 to 13 hours, depending on the start time and the number of flight sectors (landings) performed. Pilots must also be provided with mandatory rest periods, usually at least as long as the preceding duty period or 12 hours, whichever is greater. These complex regulations ensure that flight crews remain mentally sharp during critical phases of flight, with even stricter limits applied to night duties or trans-Atlantic "long-haul" operations.