As you'd expect, this challenge is for listening to audio books. Any audio book counts. I was actually surprised I got my usual goal of 12 in considering I usually listen in the car and I was staying home and working from home for so much of the year. But I did it.
So I see no need to change what is working. I'm once again signing up for the Stenographer level, which is 10-15 audio books.
I'll list them below as I complete them.