What Is the “Right” Length? It Depends on the Medium

Why are most pop songs, podcasts, movies, and even emails the length they are? It’s not just about creativity—it’s often about what the format allows, what the audience expects, and what business models demand.

Let’s explore how different mediums have shaped the idea of “just the right length.”

Music: Songs Built by the Record

Most hit songs are around 3 to 4 minutes long. This is not due to the magic of human attention span; rather, it is because old vinyl records (such as 45 RPMs) could only hold about 3 to 5 minutes of high-quality audio per side.

That technical limit set a standard—and it stuck, even long after the tech changed.

Today, streaming platforms have subtly shifted song lengths again. Some artists create shorter songs to increase repeat plays and boost revenue.

Books: What Fits on Shelves—and in Hands

Ever wonder why most novels are around 300–400 pages?

In the past, physical limitations played a significant role—longer books were more challenging to print, bind, and sell. Bookstores also had limited space, so publishers had to pick titles that would sell quickly and fit neatly on shelves.

Now, eBooks and audiobooks allow for longer or shorter formats to thrive—from 80-page novellas to 40-hour fantasy epics.

Movies: Long Enough to Feel Worth It

A typical movie lasts 90 to 120 minutes. This duration enables theatres to host multiple screenings daily, providing viewers with a sense of value for their investment.

However, streaming has transformed the landscape. Limited series or multi-part documentaries offer flexible storytelling that doesn’t need to squeeze into a two-hour window. At the same time, some films now push past the three-hour mark without worrying about showtimes.

TV Shows: A Matter of Ads and Time Slots

Traditional sitcoms are around 22 minutes long—perfect to fit into a 30-minute slot with ads. Dramas typically ran about 42 minutes for the same reason.

But with streaming, there’s no ad break to work around. As a result, some episodes now run 28 minutes, while others run 75 minutes. The length is determined by the content, not the other way around.

News: What Fits Between Ads—and Morning Routines

Two main factors shaped the physical size of a newspaper and the length of articles:

1. The time readers had over coffee or during commutes.
2. The space is needed to sell ads.

Today, digital news is endless—but people still tend to skim. That’s why newsletters, headlines, and summaries are growing in popularity.

When Technology Shifts, So Does “Normal”

• Podcasts made hour-long interviews feel normal.
• YouTube has discovered that 8-minute videos are the ideal length for monetisation.
• TikTok has made 15-second videos sufficient for going viral.
• LinkedIn made resumes bite-sized.
• Substack is bringing back long-form essays.

Each platform or technology comes with its own hidden rules, and those rules quietly shape our expectations of what’s “just right”.

Final Thought: The Medium Shapes the Message (and Its Length)

There’s no universal perfect length. What feels “right” is constantly changing—with the platform, the tech, and the audience.

So next time you find yourself wondering why a podcast is an hour-long or why that newsletter is exactly five bullet points long, remember: form follows function—and function follows the tools we use.

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