I believe this is the 2nd class I've taken from David. The first one is his 40 minute class. Even though he said that it is long in the video I thoroughly enjoyed it. It could be that I have the time to watch through the whole thing.  But David is right in what he said about 'size' does matter.

This class I did about 2 weeks ago and it seems to be trending very well.

==> http://skl.sh/2bzRgyb

It is 22 minutes long.

Mine fits in perfectly within the range of 15 to 25 minutes.

After watching this video, in my next class, I am going to try 10 minute class and see what happens but it means it has to be SUCCINCT!  He shows that a 10 min class trends very well too.