I run my lights 24-7 for autos, but 20-4, is ok too. More light is better, imo.
I've grown a few NLight autos, before, but my seeds came from Nirvana, where did you get your seeds ?
A couple of mine got pretty big too.
Sounds like you might have a photo by mistake, again where did you get your seeds ? And can you post a picture of them ?