How much vegetative growth (roots, stems, leaves) after switch to 12/12?!!?!

So how much vegetative growth could I expect after the switch to 12/12 before plants begin to put energy into bud production?

How much will roots grow? Will stems thicken out? For how long into 12/12 will this growth continue?

I had some plants that were a bit stunted and they have some REALLY tiny lower branches. Some of them are no thicker than fan leaf stems!! Will these branches thicken up and support some buds... Or could I possibly trim off a bunch of these lower branches in the first week of 12/12?

I will try to post some pics tomorrow... the lower branches on these WWs seem really stunted.

hi souldougt. I just switched my plants to 12/12 as well. they are 9-17 inches tall and i am also curious about the smaller leaves. I dont believe they will produce much bud, but I wonder if they help the plant take in more light/c02?
here are some plant pics

https://www.rollitup.org/3765362-post16.html

first pic is a day before 12/12 second is a week later and all the other pics are a week apart..the first 3weeks of flower it will grow alot and pretty fast..depending on what kinda light u got and a few other things of course