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

Configuration
4

Try this:

- platform: template
  sensors:
    greenhouse_last_changed:
      friendly_name: 'Greenhouse Last Changed'
      entity_id:
        - sensor.time
      value_template: >
        {%- set time = (as_timestamp(now()) - as_timestamp(states.switch.greenhouse.last_changed)) | int  %}
        {%- set minutes = ((time % 3600) // 60) %}
        {%- set minutes = '{}minutes'.format(minutes) if minutes > 0 else '' %}
        {%- set hours = ((time % 86400) // 3600) %}
        {%- set hours = '{}hours '.format(hours) if hours > 0 else '' %}
        {%- set days = (time // 86400) %}
        {%- set days = '{}days '.format(days) if days > 0 else '' %}
        {{ 'Less than 1 minute' if time < 60 else days + hours + minutes }} ago
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