Thats up to you cole, it depends on how big you want your plants to be. The rule of thumb is generally to let them veg until they are half or a little more than half the size you want them to be when they finish, before you switch to flower. That can vary depending on genetics, and how they were bred. I know at least a strain or 2 from "Mandala seeds" claims to go antywhere from double to triple the size when you switch to flower.
peace
davejohnwright Reviewed by davejohnwright on . hows this going now? grow box/first grow advice welcome so i got some scrap wood and built a little box, picked up a long tube light with 2 40 wt plant lights, and 4 100w equivalent (uses 27 w) and 1300 lumens each. Brand is n:Viion and they are the daylight brightness ones. for soil i went with earthgro topsoil , and osmocote indoor outdoor plant food.wich i mixed up with the soil before planting the sead, the plant food had this on it 10.0%ammoniacal nitrogen 9.0% nitrate nitrogen 6% avalable phosphate 12% soluble poash also the Rating: 5