What's the Sweet Spot?

Length A Barrier?
When it comes to podcast, length is for me. I'll often read the description, look at the length of the podcast, and find myself wishing I could read the text. I would rather skim the article to look for the pertinent information, then, if intrigued, I'll fill in the details by reading other parts of the article. If there is no text, I look at the length and usually decide not to bother. 45, 35 even 25 minutes seems daunting. I'm looking for the CliffsNotes version.
Podcast Sweet Spot
AudacitytoPodcast.com suggests the sweet spot is 30 to 45 minutes, about the length of a commute. That's really generous.
Cision.com claims the average length of a podcast is about 30 minutes with users actually listening 22 minutes. They cite the average commute at 20 minutes. Users prefer podcasts that are 16 minutes.
7 Podcasting Best Practice
Cision's Recommendations
- Respect People's Time
- Plan Your Content
- Augment the Audio with Text (the complete text)
- Don't Use Listens to Measure Success
- Distribute - Promote - Embed
- Benchmark
- Master the Audio

Longer isn't always better. In fact, longer doesn't seem to work for readers on the web. Slate found in 2013 that readers can't stay focused. About 5 percent of people who land on Slate pages and are engaged with the page in some way. Attention span is way down. A survey of Canadian media consumption by Microsoft concluded that the average attention span had fallen to eight seconds, down from 12 in the year 2000. We now have a shorter attention span than goldfish.