How long do they need before 10Dayflush????

Don't put so much into those %s of this or that. Sexual reproduction involves a jumbling of genetics. you don't necessarily get 80/20 although those overall percents will correlate. If you want a 10-day flush, i'd wait until the calyxes have finished or nearly finished their plumping/ripening. Usually another 7-10 days after that to see enough amber to warrant a harvest. there is leeway in this guesstimate as some people like less or more amber, of course. Luckily, there is no reason to flush unless you have a toxicity you are dealing wiht, so i wouldn't worry about it too much. If you want to save effort and not mix fertilizer that's fine, but it provides no benefit to the plant nore the finished product. In fact i'd wager starving it up building blocks slows down ripening if anything at all. I'm assuming that cannibalizing itself requires more energy than using nutes gained through the roots. energy is capitol. It's currency for work in the plant. If it costs more energy to pull shit out of storage, then it will result in slower growth by comparison. Growth is not limited to leaves and stem elongation. As far as length of 'flush' if your heat is set on it... if in soil 10-14 days is fine. Soilless you want to reduce that time because the substrate does not contain as much nutes and is more quickly depleted. With hydro, it's 24-48h. The other drawback to flushing is that it can fuck with osmotic pressure in the plant - concentration gradietns on outside vs inside of cells. Drastically shifting the amount of solutes in the water that enters the plant is not optimal. it can have negative effects in some situations. It shouldn't cause apoptosis but it causes chaos instead of a consistent equilibrium in the plant. same reasons a human can die if you chug a bunch of water... your cellular chemistry will fail at some point.