Video Length
Individual videos varied in length from 8:24 minutes to 36:12 minutes
and averaged approximately 18:02 minutes. Two homework assignments
incorporated multiple videos, so the average watch time per homework
assignment was approximately 23:11 minutes. Across all homeworks, 9.2%
of student comments mentioned video length (n=113). Of these comments,
61.9% found the videos too long and the remaining 38.1% found the
videos of appropriate length. No homework assignment received zero
comments on video length. We observed that the homework assignment with
the longest watch time received 46 negative comments and no positive
comments on length, while the homework assignment with the shortest
watch time received 18 positive comments and no negative comments on
length (Fig 4 ). Interestingly, the two homeworks with the
longest watch times (Homework 4, 36:12; and Homework 7, 35:23) received
markedly different comments regarding length. Homework 4 received the
most negative comments on length of any video (n=46), as would be
predicted by its longest watch time; however, Homework 7, which was only
49 seconds shorter, received not only far fewer negative comments on
length (n=2), but also some positive comments (n=5).