While this data is not specific to "explainer" videos, it is data compiled over the viewing of business videos. http://wistia.com/blog/does-length-matter-it-do

While this data is not specific to "explainer" videos, it is data compiled over the viewing of business videos. http://wistia.com/blog/does-length-matter-it-does-for-video/ http://wistia.com/blog/does-length-matter-it-does-for-video/ Bottom line, keep it as short and as punchy as possible.