Those clocks are sophisticated instruments that calculate time by measuring electrical charges called coulombs — given the rapidity and volume of electrons that move through the measuring device the calibrator must adjust at certain points which was the delay you see — the delay is just recalibrating for the clock moving too quickly during the 10 — 10ths of a second before the delay — this insures that the actual playing time during a period is exactly 20 minutes That is not an opinion — that is science — amazing devise quite frankly.
