Veg time ? + Rep

Hi I am growing Sensi star , Chronic , White Russian & Rocklock.
I am amazed at there growth rate and need a bit of advice regarding there Veg time.
The picture below is from today at the end of there 2nd week from sprouth. Knowing that these are going to double or treble when i switch to flowering ! How long is enough Veg. time to get decent results ?????
Note: All four were topped 2 days ago to control vertical growth and get muliple cola's.

I usually start flowering when they show sex, as soon as they do that I put them into flower, I usually veg for about 4 weeks before flowering also, The plants are about 1.5 ft tall before I put them into flowering mode.. The longer you veg the bigger the plant/yield all depends on what space you have for them to grow through the flowering cycle - if you have no space issues veg for longer if you have limited space veg less.. & yes they usually double or triple their size during flowering.

i turn mine to 12/12 when they reach a foot. reason behind this is that i use a 400 watt light and the light wont penetrate a plant bigger than 2 foot. i would judge it by your space and light capabilities.

Thanks lads repped +