Pretty much when they have the roots going. Are they just slow, or has there barely been growth? Could be that they're working hard on the roots. Have you up-potted them at all? My most common issue has been drainage lately, esp in smaller (than 20 liter) pots.
Man, that black ops is haunting me.
You could still do that. I'd focus more on the bigger ones, maybe do a bit of foliar feed to speed them up a bit. That way, you could flip the bigger ones (or one of them), let the smaller ones catch up & still have a little practice harvest while you wait. That's one reason i did the winter grow, kinda trying for a continual harvest type scenario. (Also, back-up bud for just in case. I got pretty much wiped out of my spring 'stash' making a big load of meds, so it was need rather than want, but it's a nice safety to have). Relax. Plants/clones can stay in veg for months, even years (photo, not auto), cause you contol the sun (lights). Maybe High will have a clearer idea. ☮
High helped you with the water, right? He might have a better plan re that. Stick your finger into the grow medium as far as it'll go, and feel the moisture close to the stem. They suck up nutes like crazy in the last bit, putting that energy into the buds. She might need a lil more water, but the lower leaves might be dying off as harvest approaches, which is completely normal. It's a bit hard to tell, like you said.
I'd say you're in the clear, you worry too much to kill her.
