[khariel]

To me this is fairly dependent on how fast the speaker speaks. Most of the times 1.25x works well. Sometimes 1.5x is too fast.

[michaelcampbell]

I find this true on podcasts; I'm normally a 1.3-1.5x person listening to podcasts, except "No Such Thing as a Fish". That one I go slower on, just because they seem to talk quite quickly, comparatively.