This is an interesting study on student attention spans when watching online video. After 9 or 10 minutes, students viewing seems to decline. Any strategies that we can use to engage students and
increase viewing?

I am not surprised by findings, but it is nice to have evidence of what we suspect!

Source:
https://www.edx.org/blog/optimal-video-length-student-engagement#.U1ZrLsc3gYh