Is this a good idea?

[downer]

I have made some videos for students, on material that isn't already well covered by videos on YouTube. Much of the time, the videos already there are much better than anything I could do because the makers have far more resources.

I was told recently in a distance education seminar, (and unusually for me, tend to agree) that videos should be about 10 minutes. But it's very difficult to split a class into a few videos like that. I did one 70 minute video. I didn't have enough time to do a shorter one!