Im flowering at 12.5/11.5

I have to because of my work schedule. will there be any adverse affects? its my first grow so it would really screw me up if they tried to revert back to veg(ive been staring at them for 3 months now, a watched pot never boils!). I need the extra thirty minutes in the morning so i can water them. thank you

should be fine

You will be absolutely fine, even 13 hrs would b ok, its not 12 hrs specifically. In the wild, they normally grow in veg while the days are getting longer. They start to flower soon after the daylight hours start to decrease, well before nature provides a true 12/12 day. As long as in veg you are giving 18 hrs or more, the drop to 13 hrs or less should trigger change. Once in flower, it should not revert bzck to veg unless light hours start increasing again.