Template to show days days / hours passed since switch on?

Configuration
3

Thanks, not sure whats wrong here, tried to use the code from link

Maybe because its a switch and not a sensor ?

  - platform: time_date
    display_options:
      - 'time'
  - platform: template
    sensors:
      greenhouse_last_connected:
        value_template: >-
          {% set value = states('switch.greenhouse') %}
          {% set last_updated = as_timestamp(strptime(value, "%Y-%m-%d  %H:%M:%S")) %}
          {% set seconds = now().timestamp()-last_updated %}
          {% set hours = seconds / 3600 %}
          {% if seconds / ( 60 * 60 ) > 1 %}
            {{ seconds //  ( 60 * 60 ) }} hours ago
          {% else %}
            {{ seconds // 60 }} minutes ago
          {% endif %}
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