How Long Should Online Course Videos Be? What the Research Says

Course creators often send us a 40-minute recording and ask us to "tidy it up". The recording is usually good. The teaching is clear and the examples work. But almost nobody will watch 40 minutes of it in one sitting, and the students who stop at minute 9 never reach the part that would have helped them most.

Low completion is common in online learning. Creators on Reddit report average course completion around 15%, and the same thread lands on the same fix: shorter modules with clear milestones.

Here's what the research says about video length, what we recommend for each kind of lesson, and how to split a long lesson without losing the thread.

What the research says

The best-known study on this comes from researchers who analysed 6.9 million video-watching sessions across four courses on edX. Their findings, summarised by the University of British Columbia, were clear:

• Engagement dropped sharply after about 6 minutes.
• On videos longer than 12 minutes, students watched only about 3 minutes on average, which is less than a quarter of the video.
• Videos that mixed the instructor's face with slides held attention better than slides alone.
• Videos with a personal, informal feel did better than polished studio recordings.
• Lecture recordings chopped into pieces were less engaging than videos made specifically for online learning.

The study looked at free online courses, and paid courses may see different numbers. The direction is the same in the course data creators share: attention fades as a video gets longer, and short, focused lessons keep people going.

How long each type of lesson should be

Different lessons do different jobs. These are the lengths we work to when we edit:

These aren't strict rules. A 9-minute lesson that covers one idea well is better than three 3-minute videos that repeat themselves. But if a lesson passes 12 minutes, it nearly always contains two or three lessons inside it.

How to split a long lesson

When we cut a long recording into a series, we follow the same steps every time.

1. Find the single outcome of each part. Ask: what can the student do after this section that they couldn't do before? Each answer becomes one lesson.
2. Look for the natural breaks. Teachers change topic with phrases like "now let's look at" or "the next thing is". Those are your cut points.
3. Give every lesson a clear start. Open with one sentence saying what this lesson covers. If the original recording doesn't have one, a short title card does the job.
4. End with what comes next. A one-line bridge to the next lesson keeps students moving through the module.
5. Name lessons by outcome. "How to set your first price" tells a student far more than "Lesson 4".

For example, a 45-minute recorded workshop on pricing might become:

• Why most new coaches underprice (4 min)
• Working out your minimum price (6 min)
• Three pricing models compared (7 min)
• How to present your price on a call (5 min)
• Raising prices for existing clients (5 min)

Same content. But now each piece is short enough to finish, and students can come back to the one they need.

Pacing inside the lesson

A 6-minute video with long pauses and repeated points feels longer than a tight 10-minute one. Length and pacing work together.

When we edit a lesson, the pacing work usually includes:

• Removing repeats. Instructors often explain something, then explain it again slightly differently. Students need the clearer version once.
• Cutting the warm-up. The first 20 to 30 seconds of a recording are often the speaker settling in. Start where the teaching starts.
• Changing what's on screen. Switching between your face, your slides, on-screen text and examples gives students a reason to keep looking, which matches the edX finding about mixing faces and slides.
• Tightening pauses without making you sound rushed. Some pauses help a point land. Long gaps while you check your notes don't.

What about total course length?

In our experience, students judge a course by whether it got them the result it promised. Padding a course with extra hours of video doesn't help them get there faster, and it gives them more places to stop.

As a rough guide:

• Mini-courses: 30 to 90 minutes in total, split into 10 to 20 short lessons
• Standard courses: 2 to 5 hours, organised into modules of 4 to 8 lessons
• Flagship programs: longer, but always broken into modules that each feel finishable in one sitting

Most of the courses we edit end up between 30 and 60 lessons once long recordings are split properly.

When longer videos are fine

Some content earns its length:

• Recorded live sessions and masterclasses, where students want the full experience
• Deep technical walkthroughs where splitting would break the flow
• Advanced audiences who already know they want the detail

If a video needs to be long, add chapters or timestamps so students can jump to the part they need, and say at the start what the video covers.

Frequently asked questions

What is the ideal length for an online course video?

Between 3 and 6 minutes for most lessons. Research on edX found engagement drops sharply after around 6 minutes. Walkthroughs and case studies can run longer, up to 10 to 15 minutes, as long as they stay focused on one task or story.

Are shorter course videos better?

Usually, yes, as long as each video is complete. Short lessons are easier to finish, easier to come back to, and give students a sense of progress. A video cut so short that it leaves an idea half-explained doesn't help anyone.

How many lessons should an online course have?

It depends on the outcome you're teaching. Mini-courses often have 10 to 20 lessons. Standard courses usually have 20 to 60, grouped into modules of 4 to 8 lessons each.

How do I make students finish my online course?

Keep lessons short and focused on one idea each, name them by outcome, group them into small modules, and keep the pacing tight. Clear audio and visuals that change with the content also help students stay with you.

Can a long recorded lecture be turned into short course videos?

Yes. An editor can find the natural topic breaks in a long recording and turn it into a series of short lessons, each with a clear start and end. It's one of the most common jobs we do.