If a heater it or any device is turning on and off how long does it need to remain in that state until the power log is able to show it?

Currently I have a heater with it's own built in controller, it's garbage, but the point is it's turning my heater on and off every 1-3 min while the Apex is still in an on state as it should be.

I intentionally sent the power alarm low to see how frequently it was cycling and the alarm worked but the log doesn't seem to be able to show it.
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