US video viewing via TV, internet and mobile, by demographic

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"The typical American continues to increase his/her media time, watching almost 35 hours of TV, 2 hours of timeshifted TV, 22 minutes of online video and 4 minutes of mobile video, while also spending 4 hours on the Internet each week. In addition, Americans now spend 35% more time using the Internet and TV simultaneously than they were a year ago – spending up to 3.5 hours each month surfing the Internet and watching TV at the same time."
Source: Nielsen 3 Screen Report for Q4 2009, released March 2010
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