Out of a typical hour of American television programming, about sixteen minutes are ads of some sort. How many ads get crammed into that sixteen minutes depends on how long they are. Some commercial and promotional mentions are as short as five seconds. Most are :30-60 seconds in length.
Long story short, most hours of (American) television will bombard the viewer with approximately thirty ads.
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It depends on the length of the ads, and how many segments per show, but there are 8 minutes of commercials in a half hour show
Obviously an hour long.
TV advertisements come from many different sources. Some of them are written by people who work directly for the companies doing the advertising, while others are created by ad agencies and marketing companies. Still other TV advertisements are written by freelance workers and consultants who may write ads for many different companies.
It is only in recent years that actors have been in ads. All the early ones like John Wayne weren't in ads or TV shows. Movie actors and TV actors did not cross over into the others medium. There were also many actors before the 1950's not in ads because TV didn't exist before 1950. In the 1950's and 60's many ads were placed right into the TV shows. I remember the Dick Van Dyke show having a ad right in the show as part of it. The View does that now.
Some chick who can't seem to keep her blouse fastened when she does car ads.