You can let the Pla nt in every LightSchedule as you want to .At least 18 Hours for autoflowers.
Do your Own exprerience,
In my Opinion everyone has desereved to rest. A Plant too. And i preform most Times in 20 Hours on my Automatics. Ihave let them 24 Hours too. But the Plants looked stressed. and i changed it to 22 hours
But its your Deccision,