DrJynx86answered grow question 4 years ago On autos the difference between 24/0 and 18/6 is minimum (in yield) and great (in power bill).
Just a single hour of dark will do a slight stretch, benefit rooting, and save in power bill, while not decreasing yield but maybe delaying harvest time in one or two days (overall the entire grow season).
Keep on the great care!
Happy smokes!