History stats sensor isn't updated during the defined time period

I have a history stats sensor as defined below:

  - platform: history_stats
    name: At home today
    entity_id: group.adults
    state: 'home'
    type: time
    start: '{{ now().replace(hour=6).replace(minute=30).replace(second=0) }}'
    duration:
     hours: 3

Now, during the time period of 6:30 - 9:30 I’ve digged into the HA sensors state to see the update of the history stats sensor. for some reason it shows 0m during this period, is it normal ? is there something I’m missing here ?

I’m also trying to make it work. In your case it seems that there is a space missing before “hours: 3”.