Weeks in Flower

That flower time usually means ready to chop at 9 weeks.. IF you flush like mouse said do it a week or so ahead of chop date. Im not sure about auto pots but if you’re in a soilless medium it only takes 5ish days. I don’t flush either I just taper EC down slowly the last 10 days or so.. The problem I foresee with your auto pots is they’re bottom fed no? So you’ll have salts in there you’ll wanna flush from the top I would think. May be wrong about how those work.. but then again you could just taper down the nutes as suggested. Maybe drop 20% every couple of days and last couple days be around 0.5-0.8 EC depending on your water source