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Weekly working hours:


1920 48 hours
 
1959 45 hours

1966 44 hours

1968 42 1/2 hours

1970 41 3/4 hours

1974 40 hours

1986 39 hours

1987 38 1/2 hours

1988 38 hours

1989 37 1/2 hours

1990 37 hours