Topping? Top twice and you'll get 4 med lrg colas
top once= 2 colas
twice=4 colas
3x=8 colas
4x=16 colas
Each time you divide (top), you reduce in size also. You are essentially dividing that main cola every time but it's usually done to spread out the growth to maximize the footprint of the light. I personally wouldn't top more than twice unless scrogging or unless height is drastically limited.