min veg time is 21 days.
That being said the longer you veg the more the plant has time to build a strong root system and create more omfg spelling sorry foilage. So basicly the longer you veg the more plant you will have the more plant you have the more it will yield. I would get somemoe lights in there and get a 12-18" tube like this in the pic and place it under the plant like in the pic so you get light from the bottom too.