Well, I was paraphrasing, so maybe it was thousandths --- maybe it was nanometers! :lol:
The only trouble with not doing basic checks on this sort of thing regularly is that things slip at an undetected rate. My most recent (and rather sad) example of this is my ears: I hadn't taken a hearing test for a couple of years, was horrified to find out how it has deteriorated, and (by messing with a bit of EQ on the PC) at how much I am no longer hearing.
But I get what you're really saying --- which is that it all about listening to music, and all the rest is time spent not listening to music.