And about the timing: does the famous 20 seconds from 1999 situations include the missile flight time or not?

By the way, from a former Polish Volkhov battery operator I know that the time between "transmit on" and "pusk" required for a "very good" grade in training (in this particular coastal brigade, potentially "first to shoot" in case of war with NATO, for the commander, everything below "vg" was "unsatisfactory") was 3-4 seconds. As I was told, they were able to do it by:
- early detection using PRV-13!! (supposedly, in some situations more sensitive than P-18)
- prediction of flight parameters (incl. speed - therefore many launch parameters could be set beforehand) using correct interpretation of P-18 picture. The "transmit" was switched on when they were sure when the target mark would exactly appear on the screen (that meant all three boresight lines roughly in place).