I don't know which lecture you mean, Abhi, but in general, the
arguments for several shorter videos are:
Watching a video is anyway a very different experience from
attending a lecture.
A long video can take ages to load if you have a slow or wobbly
If you have to interrupt watching to do something else, it can be
difficult to find again the point where you stopped.
And as you asked on the Universal Subtitles / Amara help
Transcribing (i.e. the first stage of subtitling with Amara) is
usually a one-person job, because others are afraid to mess up the
transcript in progress by adding things in the wrong place. So if
you want to produce collaboratively on the subtitles for a long
lecture, it is easier to work together on that if its video is
divided in smaller parts, each of which different people can