8 week flowering time minimum.
after week six you should see an explosion of growth that wil leave you questioning reality.
damn, i am already questioning reality and think of how badly grown some buds really areout there. did you see on my pic that i just posted, the bud is huge.. right beside it there is a one inch T8 fluorecent, compare that to the bud. if they get bigger i'm gonna piss my pants lol
i did veg them for that long, three weeks(from seed though), and got 10-11 internodes from that, and only about 8 inches height. i think the trick is to use side lighting, which made them bush out to the sides, so they grew like a balloon, not only in height stretching towards the light but also to the sides. now i have the whole space filled with buds, i had to bend and tie some of them down of coarse. but the ones which indica dominated were right up to the light. i have really good ventilation there too, so they don't get burned. 90F is the temperature. besides that i throw in some dry ice in there on regular basis.
two weeks is a must for me.