3 months to get to that? No thanks. I'd already be getting close to harvesting some nice big plants in that amount of time. And you still have to spend months flowering. It might look neat but seems like a complete waste of time to me. Others might feel differently and that's fine if they want to spend twice as long to end up with the same amount of weed.
The only reason I'd spend that much time growing some plants is if they were long flowering sativas that take 16-20 weeks to flower.
Your grow. Your show. But I don't think the end result will justify the amount of time spent.
That is a long veg though I see the point behind it... I vegged my mainlines for 8 weeks and now after 8 weeks of flowering, they are getting floppy. I had to tie 5 colas up yesterday afternoon and secure another 5 against impending flop.
I fed si on a weekly basis this run and I did see an improvement over my last grow that I vegged for 6 weeks and had probably 15 floppy colas..maybe another 4 weeks would eliminate the need for any support...
Time spent watching the plant grow is better than time spent doing maintenance haha