I'm starting to grow auto flowering as well. I'm a beginner with growing bud, but I have a lot of gardening experience. No matter what plant it is, it is not good for there to be no dark cycle even how short it may be. Most say 18+ hours is ideal. I'd say 20 hours of light 4 hours of darkness. In the end it shouldn't make a significant difference but I recommend a dark period.
I have never grown an auto, but I do know they flower based on age and not light cycle. So I would think you could do 24 hours, and that would maximize yield.
merry Christmas to you too!
The same lights thats used for regular photoperiod strains.
they seem to be ok outdoor autoflowering, but indoor some autos need continuous 12/12. so if your having trouble try this
