If you see the same film at the movie theater, on TV in North America, or on TV in Europe, you wont sit in front of the film for the same amount of time! For example, a film which, at the movie theater, is 90 minutes long, will be 86,4 minutes in Europe and 72 minutes in North America. This is because there are not the same number of images per second from one system to the next. The movie theater projects the films at 24 images/second, while in for TV in Europe the PAL standard of 25 images per second is used. Finally, the TV standard NTSC of 29.97 images/second is used in North America. So each film will be slightly faster or slower, although you don’t notice it.