Im not 100% sure but

Originally Posted by Geronimo420

as long they get their 12 hours or more of continual darkness each and every night it's OK they will produce enough budding hormone to stay in flower. Extra hours off lighting would be more problematic making them revert to veg.

The technique I use it's like mimicking nature and I've been doing it for years with no problems. As for extra hours off lighting would be more problematic making them revert to veg your wrong. It's when you give them more light the plant would reveg.

12/12 or anything less will work