For as long as it takes for the plant to mature and go to alternating node placement.
stinkyattic Reviewed by stinkyattic on . Average Time? on average how long to you vegitate before you switch over to 12/12 for flowering? i was thinking around 30 days or untill the plant was 1ft tall, once its in the flowering stage how long does it need 12/12 on average? Rating: 5