Biggs and Richwine examine the American Time Use Survey to find that:
What we found was that during a typical workweek, private-sector employees work about 41.4 hours. Federal workers, by contrast, put in 38.7 hours, and state and local government employees work 38.1 hours. In a calendar year, private-sector employees work the equivalent of 3.8 more 40-hour workweeks than federal employees and 4.7 more weeks than state and local government workers. Put another way, private employees spend around an extra month working each year compared with public employees. If the public sector worked that additional month, governments could theoretically save around $130 billion in annual labor costs without reducing services.
We’ve excluded teachers from the full-year comparison because of their naturally shorter work year. But could public-private differences in work time be due to other occupational differences between the sectors? Large differences in work hours actually persist even when comparing workers with similar jobs and similar skills in each sector.
And this made me laugh: