Flower to Veg?

so if you turn your light from 12 hrs, to 18 hrs of light will itbe enough to put the plant back into veg. Lights were switched 1 day after noticeabe white hairs, very small 7 1 1/2 inch plant 6 nodes. the other is smaller 5 nodes 5 inches.

any advice is greatly appreciated.

Simple answer = Yes

Are you saying you switched BACK to 18 hrs after the hairs showed? or switched TO 18 hrs after seeing hairs? If you saw the hairs during 18 hours I would up it to 20. If you just meant it only showed flowering for one day before you switched it back then it prob caused some stress since being in the 1st week of flowering but chances are you will be fine. If it wont stop "hair" production after 4-5 days, then give it a couple more hrs.

If none of this helps, i believe you have an autoflower

more simply, what stalmatt said lol