Light cycle does not affect when an auto flowers.
It is a combination of things, but the majority is genetics. You might speedup a day or two with a long light cycle, and root restriction will cause a slightly earlier flowering, but will result in a hard to manage (feeding) small plant. the seeds have been breed to go into flower somewhere in the 30 to 45 day range (strain dependent)
About 60 to 65 days from sprout is about as fast as I've seen a strain finish.