Questions about 12/12 from seed growing

Hey all , before you tell me I'm wasting my time ,
I'd just like to know more about the 12 12 from seed method .

Now , I have a g13 autoflower diesel and I'd like to kno if I can use that since its auto flower

and how long would it take

Read here. Lots of good info.
https://www.rollitup.org/indoor-growing/416589-12-12-seed-thread.html

Most aqutos are quick enough aren't they? Could you at least give them the 18/6? Good luck!