3 ms·

Well if I'm sober from a mental perspective, I can reverse >=11 digits if heard with a speed of 1~2 Hz.

• graeme 8y ago
  Are you chunking them? I don't really have a good sense of what that speed implies mind you.
  • osrec 8y ago
    I guess they meant 1 to 2 numbers said out loud per second
    • namibj 8y ago
      You are correct, and I can neither confirm nor deny your parents question, as I've been out of (mental) shape due to the time of day. I don't think I did, las time i tried.