A “one-hour” TV program has between 39 and 42 minutes of content. The remaining time is commercials — roughly 20 minutes per hour of content. Many times, they have commercial interruptions with 5 minutes of each other. And, the final commercial interruption period has been extended to about 8 minutes.
In the 1960s-70s, a typical “one hour’ TV program had about 48 minutes of content.
Netflix has zero interruptions for commercials.
I think you're looking at it wrong. The "content" is the commercials. All that other stuff if just filler to get you to watch the commercials.
Of course that model breaks badly in the days of DVRs, where you can skip the commercials at will.
I have 3 shows that I watch on a regular basis, and I have no idea whatesoever when they come on. I just look at my queue and if there's something new and I have time I watch it then.