There's not really a "time" to flip. You have to base it on your grow area. Obviously if youre working with a big area you can veg bigger plants. But if you're area is small then I'd focus more on LST and getting a even canopy and not waiting too long to flip and the plant outgrows your grow space. With you having Autos there isn't a "flip" time because the plant will switch on its own. If you're growing photos she will never make flowers without the 12/12 or 11/13 flip. I prefer 10/14 when flowering photos. Good luck