The Bureau of Labor Statistics recently released the results of the 2014 American Time Use Survey, an annual survey of around 11,000 Americans who are asked to give a detailed description of what they did on a particular day. Using that data, the BLS can estimate how much time people spent on various activities on average.
The averages are among all survey respondents, regardless of whether or not they participated in a given activity on their survey day. So, for example, people who are unemployed would have been considered to have participated in "work and work-related activities" for zero hours, and are incorporated into the average as such.
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