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Weeks. Ask yourself the same question in a month. Looks good.

Both Potassium and Magnesium are mobile, thus I wouldn't expect to see deficiency symptoms appear towards the tops first. Calcium is immobile and deficiency symptoms can look pretty similar to mag or potassium deficiency, until the brown splotchy leaves begin to show. Being immobile also...

Something's got it. Pest or disease. Give it a really close inspection. If it's nothing above ground, it might be root related if you've been watering often while it's been hot. Ground maybe staying a bit soggy a foot or two down, if you've been watering thoroughly and often. Root rot can give...

Whatever you choose to use for a boost in N or K do it sparingly at first. They've come this far. Not a long time left, but plenty of time for things to go more wrong. You probably won't see the leaves get any better either, but it may slow progression down. If you didn't have a really close...

I wouldn't look far into it to be honest, if the plants are chugging along and healthy. It's only really reliable using an inert medium and soluble nutrients. If you haven't been watering until a little waste / runoff each time, then I'd start doing so. Just a bit of a trickle is enough really...

@PopAndSonGrows You really got me thinking about this lol. Next to impossible in reality I think. Be a tough task to isolate a specific group of plants (or many groups of plants), to essentially evolve and have unique, different defining characteristics than any current cannabis / hemp...

Curious if it's mainly the upper growth showing symptoms? When symptoms started to show, did they appear on the tops first? Looks to me like calcium maybe locked out or deficient. Maybe magnesium too. They often go hand in hand. (if one is deficient the other likely is too) There's general...

Theoretically no. You wouldn't get enough genetic drift. Landrace or Heirloom variety sure. But new subspecies all together would require a lot more space, a lot more time, more varietals and a whole lot of luck.