How about small chunks of iterative learning material for creating a wildlife forest garden?
I had been learning Welsh using SaySomethingIn.com, the language learning system was a small amount of spoken Welsh every day, so that you eventually start speaking without thinking, and you learn the writing later. Pimsleur have something similar.
And because of my son’s new-found interest in music, I’m learning the basics of the free digital audio workstation LMMS, using the two dozen 10 minute YouTube videos by TJ Free.
I had planned for my forest garden design classes to be about an hour (my original course is 3 hours 45 minutes!) but maybe I should be looking at a small, regular format? Something you can watch every day in 10 minute chunks? A condensed course of 20 x 10 minute chunky classes?