As I've started trying to be more professional about it, the time it takes to produce content has grown quite a bit.

20 minutes of me talking into the camera takes 2-4 hours to plan, outline, film, and edit.

30 minutes of screencast takes about 8 hours to script and film, and edit. The planning/research phase before that takes really long, because I try REALLY hard to avoid dependencies on jargon and specialized knowledge, to make the material accessible.

I'm actually about to experiment with a series targeted at more experienced sysadmins, where I can just improvise and work on a practical project without much planning or gradual explanation of the fundamentals. I'm hoping those videos will be much faster to create.

I spend a LOT of time thinking up and planning material, though -- not really sure how to count that.