See ESC right:

Work, reasonable hours of

Relevant ICESCR Articles:

07(d): The States Parties to the present Covenant recognize the right of everyone to the enjoyment of just and favourable conditions of work which ensure, in particular:

(d) Rest, leisure and reasonable limitation of working hours and periodic holidays with pay, as well as remuneration for public holidays

Related Documents:

Additional Protocol to the American Convention on Human Rights in the Area of Economic, Social and Cultural Rights; "Protocol of San Salvador"

European Social Charter

Universal Declaration of Human Rights