IME, The only time you should want to start at 12/12 is to keep the plant small and have it flower in as little time as possible.
The time it takes for a seedling to show maturity during veg (18/6) is alot faster than starting at 12/12 and having to reveg again, not to mention you will be able to pull clones immediately once your 18/6 plant shows maturity, as it will be 2-3 times the size of the seedling started at 12/12.
I have heard about putting clones into flower just to sex the plant. I have been studying about revegging a plant as well. Also, isn't revegging a flowering plant called monster cropping or something of the sort?
Either way, I did waste quite a bit of nutes on that male but I'm not butt hurt about it. All these plants were bag seed I had friends save up. Using them to work out the kinks of my bubbleponics setup I rigged together. Long term, I plan on having about 4 different lights and rooms (seedling, veg, 1 or 2 flower, clone) and maybe one day even breed. Aiming to have a new crop every month. I don't know why I didn't start growing 10 years ago. Only reason I started now was because someone gave me a new aerogarden. My landlord used to grow here in my house when he lived here. There's a secret room with electric and ventilation that I've just been using as storage space. He'd probably let me pay my rent in weed lol.
But yep, never even grew a plant in soil, straight to hydro. Once I knock this out I'm definitely getting some feminized seeds and learning to clone.
One thing I was wondering. How long can a plant veg for indoors? Forever?
(sorry about the blurples, trying to keep it low heat and cost efficient). Currently running a 450w and 600w viparspectras, 460 actual watt's drawn from the wall.