From seed, I put a 2 week old plant into flower. It was about 4-6 inches tall and I ended up with about an 1/8th dry.
With clones, as soon as they show roots i plant them in soil and let them veg for about 1-2 days. As soon as I seed new growth I put them in 12/12. My clones are about 6 inches tall when I flower them. The first time I did this I planted them in keg cups and got between 8-15 grams dry from each and ended up with over an ounce from 4 clones. This time I planted 6 clones in king size burger king cups