I was going to ask, because any latency means picking up packages at a random pick-up point.

My office is in the other end of the house, and most package delivery service press the doorbell and starts working away instantly. While that's also a bit extreme, I can't expect them to stand around for more than ~30 seconds.

It's just a few seconds and a lot of that is the HA polling interval.

for me its (length of wire/signal propagation speed through copper wire) + (distance from buzzer/speed of sound)