eight-hour day; eight-hour workday system
Refers to the system or principle of an eight-hour working day. Often used in labor contexts; compare 八時間労働制 for the full phrase.
See also: 八時間労働制 (はちじかんろうどうせい)
An eight-hour day system has been introduced at this factory.
Upholding the eight-hour day is a worker's right.