@FullAuto245 they say two weeks for soil. One week for coco and I think one day or two days for hydro before harvest. Now this is all a grey area. Just because your flushing your soil does not mean the nutrients are not in the plants leaves still. So even though people flush the plant is still drawing in nutrients. And this is dependent on how much was in the soil prior to the flush. Most people try to give the most nutrients they can. I can tell you now that a non flushed plant tastes like crap. But i can guarantee you alot of peoples bud that is not organically grown has chemicals in it especially bought black market. So if your buds are ready and your flushing and your leaves still are living.. well your buds still have gotten chemicals/nutrients everyday of that flush. it's why I'm going as organic as i can as soon as I can. Also, a plant only lives so long after flowering. So it's also natural for a plants leaves to change towards end of life. The flowers have pulled all the nutrients from the leaves to swell as much as they can to try to get pollinated.