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I can't vouche for the veracity of this but:
Like I said. As I intuitively guessed from my own experience, 60 hours is the point.
Based on the information gathered on the participants through the WHI and from the researchers own interviews, they concluded the following:
The estimated prevalence of fatigue in the U.S. workforce for a two-week period was 37.9%.
Fatigue was more prevalent in women, workers under age 50, white workers and workers earning more than $30,000 per year in "high control" positions—that is, jobs with a lot of latitude in making decisions.
Overall, 9.2% of U.S. workers with fatigue reported LPT specifically due to fatigue in the previous two weeks. Such workers lost an average of 4.1 productive work hours per week, most of which was reflected in reduced performance at work rather than absence from work, i.e., presenteeism rather than absenteeism. For these workers, fatigue affected their work performance primarily by impairing their concentration and increasing the time it took them to complete tasks. And distracted workers are naturally more likely to have safety incidents.
Bottom line: The researchers estimated that workers with fatigue cost U.S. employers $136.4 billion per year in health-related LPT—$101 billion more than workers without fatigue.
The estimated prevalence of fatigue in the U.S. workforce for a two-week period was 37.9%.
Fatigue was more prevalent in women, workers under age 50, white workers and workers earning more than $30,000 per year in "high control" positions—that is, jobs with a lot of latitude in making decisions.
Overall, 9.2% of U.S. workers with fatigue reported LPT specifically due to fatigue in the previous two weeks. Such workers lost an average of 4.1 productive work hours per week, most of which was reflected in reduced performance at work rather than absence from work, i.e., presenteeism rather than absenteeism. For these workers, fatigue affected their work performance primarily by impairing their concentration and increasing the time it took them to complete tasks. And distracted workers are naturally more likely to have safety incidents.
Bottom line: The researchers estimated that workers with fatigue cost U.S. employers $136.4 billion per year in health-related LPT—$101 billion more than workers without fatigue.
Researchers found that for workers who worked less than 60 hours per week, the injury rate was negligible. But at the 60-hour mark, the injury rate increased steadily, peaking at the 80 hours per week mark. (Note that the only workers who reported averaging workweeks above 80 hours were salaried workers who performed sedentary jobs. So it’s not surprising that the injury rate for this group was low.) In addition, working 60+ hours per week led to the onset of one or more diseases and to the greater likelihood of at least one acute or other work injury. In contrast, working moderate overtime (defined as 48.01-59.99 hours per week) didn’t have any significant impact on workers’ health or safety.
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