The YouTube Creator Channel explains the optimal length of videos. This will be helpful for creators who have already uploaded videos and those who are planning to upload videos to YouTube.
Is longer YouTube video more advantageous; is a one-hour video more likely to be recommended than a two-minute video?
As it turns out, that is not true.
YouTube always tries to present videos that are satisfying for the user. It seems that a satisfying video is not always a long video.
Longer videos seem to have an advantage in YouTube's algorithm because of the increased viewing time. However, the length of the video alone does not determine which videos are displayed on the search screen or in related videos.
All parameters, such as average viewing time and average playback rate, are taken into consideration to determine which videos are displayed.
The length of videos displayed on the YouTube home screen and related videos varies: some videos are shorter than one minute, while others are several hours long.
It is most important to create videos that put user satisfaction first, rather than unnecessarily lengthening the length of the video. Creators should not be limited by the length of their videos.