It was an ‘ish’ thing in everyday life because there was no way of measuring or recording it...it became a real thing if AOC said something like ‘Isn’t there a limit on time with nozzle deflected?’ at your PDA and appointed a chief sneak to time you.
Sadly the good book (ACM) would be against you and very clearly in chief sneak’s favour at this point.
Whereupon your display would be abbreviated somewhat.
That sort of ‘ish’ thing!