Plant won't show sex

I have two hydro grown auto flower plants and one soil grown auto flower plant that sprouted on Dec 1.

One hydro plant and the soil plant showed their pistils almost 10 days ago, but the other hydro plant shows no indication of sex at all.

I am very familiar with both sex characteristics, but this plant has nothing on any of the nodes to show its sex yet.

It has been very long for an auto flower to remain like this (over 5 weeks now), especially a hydro plant that is growing so thick and bushy and large, so I suspect that the seed was mixed up when packaged and it is a photo plant or maybe it is a hermie.

I do not have the ability to grow it like a photoperiod plant at the moment without messing up the other two auto plants in the same grow tent.

How long should I give it to determine if it is ever going to show its sex?
It is supposed to be an auto Jack (sativa dominant) feminized auto flower seed.

Might as well give it as long as you can before it is getitng in the way because it might just be alate starter. Did you top it or anything? That will set it back a bit. Worst case you hust toss it in a month if it doesn't flower...Let it go two more weeks though before tossing it if you can.

hermie would have shown
from what ive experienced if you burn them a bit and then they adapt and you keep pushing veg nutes then it keeps veg'n and becomes a monster plant not all auto's or pheno's will do it
dial your nutes back and push some P and K on it and it may very well kick it into flower
dont toss it
even if it finishes late its not a bad thing the other plants will be done and out of the way of the monster

just FYI it probably wont do anything but slow growth if you cut the lights back