In Pocket Casts, the app I use, there's a playback speed control that can go up to 5x. I usually listen to podcasts at about 3x speed, which feels right to me. I lose a little nuance for audio fiction, but that's a sacrifice I'm willing to make.
16x audio playback speeds are typical for screen readers for visually impaired users. Maybe your wife configured something like that, but they take practice to get used to. I only have some familiarity with those because I used to have a blind co-worker and had to support his setup.