Since the 19th Century, the "8+8+8 system" (eight hours of work, eight hours of rest, and eight hours of sleep) has become the mainstream in international working hour system. In 1935, International Labor Organization (ILO) promulgated Convention No. 47 and established the "40-hour work week principle." In 1962, in order to realize the 40-hour work week principle, Convention No. 116 proposing the reduction of work hours was promulgated, urging member states to adopt the idea. Furthermore, in 1976, Article 7 of the International Covenant on Economic, Social, and Cultural Rights emphasized that everyone is entitled to working conditions that include just and reasonable work hours.
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