I'm not blind. I listen to all podcasts at 2x speed and I can't stand to go back to "normal" speed because it's so slow. While doing accessibility testing I've found myself turning the voiceover prompts faster and faster because I very quickly get used to it.
If you have an iOS device, set your home button triple click to bring up a shortcut menu and put Voiceover in as one of the options (inverse colors is another good one). Test your own app in Voiceover mode. Close your eyes and navigate around. You'll be surprised at how quickly you figure it out... and what rough edges your app has.