The 48-hour week.
Mainland
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TR
D006801:Humans; D013997:Time Factors; D006113:United Kingdom; D018634:Veterinarians / Q000523:psychology / Q000592:standards / Q000706:statistics & numerical data*; D014940:Work Schedule Tolerance; D016526:Workload / Q000592:standards / Q000706:statistics & numerical data*