Growing indoors, alot of things come into play, time frame growing, yeild and so on, we all worry about that. A nice quick grow is uaually considered best. You can veg for a long time if you want, and time is not an issue, however, I veg for about one month, after 4-5 nodes minimum have formed and I have a plant that is about 12" tall. This way you end up with a decent sized, managable plant. (mine, right now are about 36" tall) prior to harvest.