Whenever i end up at free TV stations and see that they interrupt a major movie after it has only started 6 minutes ago for commercial i'm gone.
I remember being shocked at the commercial breaks in US shows when I borrowed some 'off air' copies of TNG years ago before they were broadcast over here. Our commercial broadcasters generally have two or three advert breaks in an hour long show and also play ads in between shows. There's a caption or title card displayed before and after the ads, and the ad breaks are evenly spaced.
American shows are bizarre - teaser, opening credits, no warning ad break, a few minutes later, no warning ad break, minutes later, ad break etc. until end of last scene, another bloody ad break right before the closing credits, then ad break...