Nielsen: Most-watched TV time for adults is 9:15 p.m.

NEW YORK -- The real prime time for people with televisions is at 9:15 p.m.

Nielsen said Tuesday that nearly 42 percent of American adults who have televisions are watching them between 9:15 and 9:30 at night, the highest percentage of the evening and almost certainly all day.

For younger adults, those aged 49 and younger, that prime time is at 9:45 p.m.

The information might not mean much to many TV viewers, but for advertisers and networks that set prices for commercial time, it's a valuable detail.