Duration of a switch state - In seconds

Hello,

I want to automate my pool and need timers for the switches to record how long they were on and off.
I would then like to use these to control my automation with conditions.

This is working so far for example:

  - trigger:
      - platform: state
        entity_id: switch.pool_pump_switch
        from: 'on'
        to: 'off'
    sensor:
      - unique_id: pool_pump_time_off
        name: "test1 pool pump off"
        state: "{{trigger.to_state.last_changed}}"
        device_class: timestamp

However, I would need the values ​​in seconds since the switch was last in the on or off state.
Is there a way to do this?

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