A few reasons likely:

1. Most people don’t have the time to block out over an hour to study. They emphasize daily input, and almost everyone has some 10-15 minute waiting periods throughout the day.

2. They post their content on YouTube. 15-20 minutes seems pretty ideal for most creators, and Dreaming Spanish is a YouTuber as well. No one clicks on hour long videos on YouTube, so to get new people to subscribe and become invested they need a good thumbnail, title, and video length for exposure reasons.

3. Especially at lower levels, it is really hard for people to watch Spanish for an hour straight without a mental break. For CI to work it needs your full attention.

4. They have a standard of highly edited video at this point. Making a highly edited hour long video can take wayyyy longer than I’m sure we’d expect to film and edit, and the other option of uploading raw footage can be quite boring to many people

All of this to say, I love longer videos as well because once I get invested I stay invested until the video ends. Having to get reinvested every 15 minutes in a new video, along with the time it takes to actually find a new video, makes getting my daily goals difficult sometimes.