Starting at a base line of what the plant likes, usualy takes about a year.
.5 or 1/2 grams per watt is very hard unless your scrog.
You also need to add time to the math. Pinching and trimming and even lighting to the plants.
Its to bad most new growers, do not know it , a real bitch to get the TOTAL system going.
Co2 works real bitchen if its automated to about 1500 ppm average. Thats why so many people spend the $1200 for a good system. With a 20-30 pot system it pays for itself in one crop.
You know you have it dialed in, but do not panic it may cost you a crop or two.
I must admit not much has changed over the last 30 years of growing, except for Al Gore internet.
grams/watts/month is where its at ,, otherwise its B.S.
Have fun and tell no one, when you get big never post.
Sanclem