On what logic does wyze cam decide if a sensor is offline?

Wyze sense has been out for a year now, but i still cant see a pattern of when the wyzecam polls the sensor.

i used to think this polling was done at some interval & on every cam restart, but i did some tests: covering the wyzecam with foil, i see it doesnt detect when i open the wyze sense swtich, but it didnt mark the status as ‘offline’ .

when is a sensor marked offline? does a number of hours have to pass ? i know this is a question that someone at Wyze could give us an answer for , but i was hoping maybe some people here have figured this out