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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section III : Work of prisoners of war #Chapter 2 : Organization of work - Art. 30.
Art. 30. The duration of the daily work of prisoners of war, including the time of the journey to and from work, shall not be excessive and shall in no case exceed that permitted for civil workers of the locality employed on the same work. Each prisoner shall be allowed a rest of twenty-four consecutive hours each week, preferably on Sunday.