In the United States, real wage rates in manufacturing have risen steadily from 1890 to the present. In the period from 1890 to 1930, the length of the workweek was reduced dramatically. But after 1930, despite the continuing growth of real wage rates, the length of the work week has stayed remarkably constant at about 40 hours per week.
Hourly Wages and Length of Work Week
in U.S. Manufacturing, 1890€“1983 Sources: Handbook of Labor Statistics, 1983 and U.S. Economic History, by Albert Niemi (p. 274). Wages are in 1983 dollars.

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