Source: US. Bureau of Labor Statistics
Release: Employment Situation
Overtime hours represent that portion of average weekly hours that exceeded regular hours and for which overtime premiums were paid. If an employee were to work on a paid holiday at regular rates, receiving as total compensation his holiday pay plus straight-time pay for hours worked that day, no overtime hours would be reported. Overtime hours data are collected only from manufacturing establishments.
The series comes from the 'Current Employment Statistics (Establishment Survey).'
The source code is: CES3000000009
US. Bureau of Labor Statistics, Average Weekly Overtime Hours of Production and Nonsupervisory Employees: Manufacturing [AWOTMAN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/AWOTMAN, December 4, 2016.