Automations - "Things Quiet Down"

I have an automation to turn off some lights when “Things Quiet Down”.

Why do I have to select a time?
How do I enforce the rule always?

I mean sure, I can pick 12:01 AM to 11:59PM, but there is a slight chance that “Things quiet down” between 11:59:00.001 PM and 12:00:59.999 AM.

Am I missing something?
What have you done?

You can put 12am to 12am. That should work.

Ohh good one!