long veg??

Depends on the size of your pot. You can root bound them which will cause stress and mean more waterings . They will show pre flowers when it's well rooted which is a good indicator when to flip. A 15 litre pot I will usually veg for 7/8 weeks ish. Smaller pots u can veg for less time. It also depends on your training. If you high stress train a plant it will slow root growth. So you need more time in veg for it to recover.

No. I veg mine for 2 to 3 months so they reach maturity before I switch the light schedule. Plus in the wild that is how they would naturally progress over a year. Good luck

Nope, not that I've heard of. Out door plants veg for months. Just gotta make sure you have the room for that big of a plant. Hope that helps growmie!