how much light in vegetative stage?

I am new to the forum, but I have been smoking for a while. I got some seeds that I am going to use this summer but I had a question about how much light to give a plant.

After I germinate the seeds, and when its in vegetative stage, how much light do I give it? I have read that you want 12 on 12 off while in flowering stage, but how much light do I give it in the three weeks before I flower it?

generally people will keep the plants on an 18 hours on / 6 hours off schedule. But you can have it on longer than 18hrs if you choose.

find out what time you need to plant it for best results, controlling the sun is difficult ^^

if grown outside full sun is best buy a grow book but dont rely on the jokers here good growin