I tend to resist watching long clips of talking heads on the internet (speeches, press conferences, debates, lectures, etc.) because it is so time-consuming and I find it so much quicker to read transcripts. Unfortunately. transcripts are not always available and their accuracy cannot be guaranteed. But just yesterday, I learned that at least with clips on YouTube, you can adjust the speed to suit you.
I find that playing the clips at 1.5 times the normal speed works well for me. This results in a 33% reduction in the length of time taken to watch it, which works out to a 40 minute reduction if you want to watch a two-hour lecture on some topic, not an insignificant saving. At this speed, the speaker still moves and sounds fairly normal and not as if they are appearing in a Benny Hill sketch.
I am passing this on for the one or two of you out there who may have been as clueless about this as I was.