indoor veg time

I've started my first indoor grow with 4 ak47 plants under 400w mh in soil. My question is what's the max ht i should let it get before switching to flower?

What type of area do you have? What kind of grow are you going to do. If you have no height restrictions or do you. Little more info would help.

1/3 of final size (ak47) but yeah depends on grow style

i veg for 2 months, i get 3-4 foot bushes and then get 5-7 foot trees in flower.

i usually always veg for 30- 45 days from the day the seed pops out of the soil. plants tend to finish 2-5 to 3.5 feet tall depending on strain. just make sure you give yourself at least double the height of the plant as it is now. thats usually the rule of thumb. allow for 2-3x the height of the plant as it sits now.