From the annual American Time Use survey, here:
On an average day, nearly everyone age 15 and over (96 percent) engaged in some sort of leisure activity such as watching TV, socializing, or exercising. ... Watching TV was the leisure activity that occupied the most time (2.8 hours per day), accounting for more than half of leisure time, on average, for those age 15 and over. Socializing, such as visiting with friends or attending or hosting social events, was the next most common leisure activity, accounting for 41 minutes per day.
