How long is a piece of string?
Whilst we live in an age of information overload and interruption marketing, where attention spans are getting shorter, it is important to remember one important factor: one size does not fit all.
Among the video marketing community a dogma exists that all videos online need to be 90 seconds or less. This is simply not true for all cases.
It all depends on who you are talking to and why they are watching the video.