Out put time used of WeMo Insight

Configuration
1

Hey there. I’m looking to get the daily use of my WeMo insight. Can someone let me know what I need to adjust here:

sensor 36:
  - platform: template
    sensors:
      tv_today:
        value_template: "{{ states('switch.entertainment_unit.on_today_time')}}"
        friendly_name: 'TV Today'

Thank you