In general, the duration of TV advertising slots differ from one country to another. In the United States, most television advertisements run for 15 seconds. Some ads are good for 30 seconds while others for only 10 seconds. In the 1950s, television commercials ran for one minute but only two were shown for every break.
In the 1960s, American television programs that run for one hour included 9 minute advertisements so the total running time of the show was 51 minutes. Currently, television programs running one hour had a total running time of 42 minutes, with 22 minutes of commercials consisting of 2 minutes local advertisements and 6 minutes of national ads. mega888
In some cases, television programs followed the 12 minute ads/18 minutes program format. For a total of 10 hours, the duration of TV advertising slots is 3 hours. This is two times longer than television commercials during the 1960s. The old TV programs of that era still running today were cut to pave the way for additional advertisements.
In Europe, television shows had longer commercials but fewer breaks. In this case, it would become 6 minutes every half hour rather than the usual 3 minutes per 8minutes. The European Union placed the duration of television advertisements to 12 minutes per hour. The length of every segment is at least 20 to 30 minutes, although it could differ depending on the program content.