No can do, not nearly enough info to go on! The natural veg should be until a ninth node forms and the plant goes from opposing branches to alternating branches...did I say that right? LOL Could be the opposite....I'm baked! You can send a two week old clone into veg as well. More info needed. Very strain and technique dependent as to what you can yield per plant. Sorry I couldn't help more.
On my current grow, I Veg'd under a 150 HPS on 24 hour for 30 days. They had about 7 nodes each. Then they went under the 400w HPS on 12/12 and I sex'd em in only about 5 days. I also topped them and lolli popped them so they each had only 4 nodes. I just got lucky and recieved another HPS, a 650w at a steal of a price and will easily get 2-3 OZ per, off my 6 plants. But that is over 1k of HPS. I also use super soil/nutes/molasses. What will your setup be?
Veg them till there 9 ft tall ur bound to get a zip then lol there's too many variables man we need som details