I was not thinking about the length but the actual keypress recognition. If you have enough recording of all kind of keypresses many keys/characters can be reco

I was not thinking about the length but the actual keypress recognition. If you have enough recording of all kind of keypresses many keys/characters can be recognized from the waveform itself, including the backspace and delete ones. I doubt this is a super common threat but I would expect it to be already applied by spies or "Jia Tan" like employees.