Auto plants

Welcome to 420 @Ajbazzer26

Autos are bred to flower under any lighting schedule - 24/0 or 12/12 should make little difference but as @013 advises, you are most likely to get a bigger plant, bigger yield with a longer day period
16/8 is my usual to keep costs down but still give a long day
Some autos aren't very auto though, so I have grown them switched to 12/12 and still got reasonable yields
 
With autos will shorten the days to 12hour 12 hour make it flower quicker or is this just with feminised?
The choice is autos vs  photoperiod, not feminized. Feminized seeds are treated with a chemical usually to make the vast majority female plants, and you can get both autos and photos in both regular and feminized seed.

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