I use the fretboard game regularly and also noted the best times of 23 secs. That has to be very good use of the mouse or whatever. less than 1 sec to recognise the note and then recognise where the correct button is because the button position is totally random.
I now get them correct but my best time is only 1 min 15.
I think at 3 secs per change my songs may be quite jerky.
Manx and Christopher need to do a trail on the game to give us a ballpark time rather than the best of the best of the best.
Dave