"Legally speaking" a five second clip can be copyright infringement while a 20 second clip is "fine". length of time, in terms of fair use, has to do with the o

"Legally speaking" a five second clip can be copyright infringement while a 20 second clip is "fine". length of time, in terms of fair use, has to do with the overall length of the copyrighted subject. I haven't seen the video but based on the description it seems to fall squarely under the fair use terms.