Improving Retention Time 

Nice video on Improving YouTube Viewer Retention time:

  1. Interesting, valuable content your audience cares about
  2. As short as possible! Succinct!
  3. Engage! Smile! Connect!
  4. Plenty of B-roll! (change every 3-4 seconds)
  5. Let viewers know right up front what value of video is (if they know what’s coming up it will keep them watching longer)