I’m going to point to a large number of 2 hour + Youtube videos. I can’t tell you who’s watching them, or if more people are, but there wasn’t anything like that 25 years ago. I’ll also point to podcasts and the plethora of 3-6 hour or more - isn’t Joe Rogan’s like 8 hours long? And it’s one of the most popular ones.
There’s more novels today than ever before, and people reading via Kindle Unlimited and just up and buying them.
Prestige TV is often 60 minutes or 90 minutes, in comparison to 42 being a “normal hour long broadcast show”.
There’s more kinds of content, but I disagree that the length of consumed media in general is getting shorter and shorter.