hey Ken... To answer your questions...
Purple Berry BX is an average vegger, as far as time goes.... Not slow and not super fast really....
They are healthy eaters.... and LOVE nitrogen, well into 12/12....I know you are a newer grower, so I dont want you to take this the wrong way, Please, feed lite, and if they start to yellow a little, bump up the feeding, but remember, with you being in soil.. If your plants start yellowing today, its from what ever you did last week.. I hope that makes sense to you man..
Feeding lite is a good thing... You can always bump it up IF you need to.. I think ALOT of people feed way to heavy... Less really is More in this case...
And, Honestly, You could veg them for 3 weeks, and get a nice yield, or go to 6 weeks and have big huge bushes... Choice is yours.. really it comes down to , How much head room do you have.. Purple Berry BX does NOT stretch crazy like, but expect atleast 2 x's stretch from teh onset of 12/12....
Keep up teh great work.. Glad you got 100% germ on yoru seeds.... Seems like that is the hardest part newbs have is germing.. The rest is pretty easy bro...
Just ask as many questions as you need to.... We are all in this together bro....