I'm on my first grow and am not sure of the flowering time, I have diff strains, and some are not what I was told they were, what is a good indication of when to start flushing, or when to stop the nutes?
My advice is for you to go buy a 30x microscope (don't buy a 60x! it's impossible to hold the damn things steady) so you can inspect the trichome colors of your flowers. If they are clear you still got a while, maybe as much as 3 weeks. Once they start to go cloudy that's when you know you are close and my understanding is once they go 33% amber in color the plant is pretty close to ending it's "optimal" growth period.
For most of the strains I've had experience with by the time they are about 66% cloudy and 33% clear there is about 10-15 days till they are 33% amber. So when I see that 66% cloudy that's when I begin to feed just straight PH'd water.
hope that helps.