Growing in my own soil blend, in a 32 square foot tent thats 8 ft high under 2400 watt leds I am able to veg 12 plants for 2 months sometimes even 3. BUT and its a big BUT I top the shit out of my plants in veg to target 16 colas and trim the bottoms leaving only my main stems. I wire train them to go where I want them early on like you would with a bonsai but not nearly as tightly. I have a sweet spot of height I just know from experience with my setup. My plants always have a thick base and strong branches so I rarely have a need for extra support to hold them up. Doing this i require the extra time in veg to get what I want, how I want it. If I just grow out a plant without training I give roughly 5-6 weeks before flipping to flower but due to cola weight, training, trimming and allowing the plant to recover from any stresses I give extra long veg times. Think of it like this you grow a grapevine you can pump it full of nutes and force it to grow fast and it will be tall and lanky and the fruit will weigh it down, break branches and you'll get a lot of small inferior fruit. But if you take your time let it develop and strengthen you'll get a small amount of exceptional quality large fruit. Same applies to cannabis. Less fruit sites, bigger support structure and a more mature plant gives better QUALITY over quantity. But I will say there IS a such thing is too long in veg and ive seen it happen when I first started. A female plant by herself with no bananas on her finished up flower with a few seeds in her. This is because they stress out wanting to reproduce and with no male to pollinate them they either go Hermie or produce seeds on their own ( essentially a self cloning) not all plants do this but I did have an amnesia haze female do it to me. Her seeds were viable and germinated all female plants.