1.75x is my usual. Down to 1.5x for fast talkers, and up to 2x if it's straightforward content. Am frustrated when I find myself someplace that only offers 1.5 or 2, but not the in between.
Discussion
Do you think you could work up to higher?
Not me. 2x really seems like my limit, if I want to actually process and retain what I’m hearing. And it turns an hour into 30 minutes, which is great. Getting that down farther isn’t such a big gain that I find it worth it.
Also, I’d add that while 1.75x is my norm, I do sometimes go down to 1.25x, if it’s material I have to think more about.
* further