how long does a plant take to revert to vegetative

I grew 4 seeds at 12/12, 3 of them female, i chopped the third one (male) in a half and deprived it from light since it was in the same waterfarm as a female and i believe the roots are too entangled to seperate them. Now that i know which ones are females and crippled the males, how long will it take them to revert to vegetative growth if i switch the light cycle back to 18/6?

Weeks, its hard to say how long different plants will have vastly different reactions to re-veg.
Some it may take 3wks some may take 3 months to get a plant that is truly back in veg with no leaf/growth mutations.
When I have done it I could have grown new plants from seed to finished bud in the time it took to reveg a plant.
Reveg is a bad way to go to sex plants, next time just clone them.
Then you can ether root the clones and put them in flower to sex them keeping the original mother plant in veg,
or clone the plants and flower mom and keep the clones in veg.

i have done this before. i put some plants outside really late in the year (when i was 16) and then gave the plant to my friend because i knew it would not finish. the plant was 4 nodes tall and had the tiniest of flowers, so it was not very far at all. i put it under a mediocre light setup in my friends closet and within 2 weeks it acclimated itself and began to veg again a healthfully

So long as its hasnt been longer than 2 1/2 weeks on 12/12, it should bounce back into veg in a week or two.
I was just discussing this at my local hydro store with a long time medical grower who owns the shop, when i went to pick up some supplies the other day.