You want to veg for at least MINIMUM 3 weeks.
4-6 weeks is a reasonable amount of time.

If you want to veg to your plant's peak... the best would be until it starts to show it's pre-flowers.
When it shows pre-flowers that your plants sign of say "Hey YOU, I'm reading to flower now and I am fully mature. I want 12/12 lighting now!"
poker2 Reviewed by poker2 on . Started a new plant, how long do I veg for? So after my very first plant grow it turned out to be a male... :( and was an experimental plant so not knowing what to do I may have ended the veg cycle earlier and went to flower and then went back to vegging thinking it was too early. I had veg lights on him for about a month and again was 24/0. I've started on another plant. I was wondering how long should I veg for? As of right now my veg cycle is 24/0 for about 1 and a half weeks into growing. I'm just asking so my plant doesn't veg Rating: 5