AsNoriuanswered grow question 2 years ago excess of nitrogen slowed down your flowering, but i would say 4 weeks are max till the end. Only magnifying glass will answer you, when you see mostly milky, no amber yet and not many clear left- best time for few weeks of plain water feeding.
Honestly rethink 12 ml of FoxFarm, i used this line, those numbers are insane !
Less is more in growing, believe me. Try next time one girl at least feed very little, just ph will be essential in such grows, you have to strictly follow 6.3-6.4 , i honestly presume you are in soil
Happy Harvesting !