Research Indicates that shorter videos tend to engage the audience better.

• "the median engagement time for videos less than 6 minutes long was close to 100%" - doi: 10.1145/2556325.2566239
   
• "Making videos longer than 6–9 minutes is therefore likely to be wasted effort" - doi: 10.1187/cbe.16-03-0125
   
• "students only watch on average, 2 to 3 minutes of each tutorial video, regardless of its length." doi: 0.17770/sie2016vol2.1424
   
• "video length is almost twice as important when it comes to disliking a video" - doi: 10.1016/j.chb.2018.03.036
   
• "shorter videos influence students’ decisions to use video again for future learning" - doi: 10.1111/bjet.12313

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