Time elapsed counter

Configuration
2

Here’s one way that might work for you. (I tested it and it seems to work ok. Obviously replace input_boolean.dryer with your dryer on sensor.) Don’t forget to exclude sensor.dryer_on_time from the recorder, otherwise it will “spam” your database. :slight_smile:

input_boolean:
  dryer:
input_datetime:
  dryer_start:
    has_date: true
    has_time: true
automation:
  - trigger:
      platform: state
      entity_id: input_boolean.dryer
      to: 'on'
    action:
      service: input_datetime.set_datetime
      entity_id: input_datetime.dryer_start
      data_template:
        datetime: "{{ now().strftime('%Y-%m-%d %H:%M:%S') }}"
  - trigger:
      platform: time_pattern
      seconds: '*'
    condition:
      condition: state
      entity_id: input_boolean.dryer
      state: 'on'
    action:
      service: homeassistant.update_entity
      entity_id: sensor.dryer_on_time
sensor:
  - platform: template
    sensors:
      dryer_on_time:
        value_template: >
          {{ (as_timestamp(now())
              - state_attr('input_datetime.dryer_start', 'timestamp'))
             |timestamp_custom('%H:%M:%S', false) }}
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