Operating hours counter?

Hi there,
I would like to make a kind of operating hours counter that tells me about cleaning tasks after a certain running time.

I use an ITC pellet stove, it should be cleaned every 8 hours and cleaned every 36 hours.
Since it is overlooked again and again, a message via Homeassistant would be nice.

It is switched on with an MQTT switch “switch.pelletofen”.

How do you do that most sensibly?

Warm greetings
Gerald

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can create a sensor where entities are in a specific state.