well blazin, the length of the vegetative stage depends on many things. It depends on how tall you want the plant to finish at, as plants will double to triple in size during flowering. Also, if you are growing under flourescents you need to remeber the limuited length of the lights' power, so grow accordingly. I dont mean to sound rude, but the question you ask makes me think you need to do a bit more reading. There are many great sites, like this one, and overgrow.com, and also any book by ed rosenthal is good. And same disclaimer to cherylsyv, but the forums are to ANSWER questions with facts or from experience, not to just guess. While your response isnt wrong, its not really right, because there are many answers to his question. If you dont know, dont post a guess, let someone else take care of it.