I just start when the second node from the top can b bent over and reach the edge of the pot. If that makes sense? Like it doesn't have to touch it, don't want it to snap, but being able to eye that is the proper distance basically. The goal of LST is to train the main kola back and open up the middle. it also stresses the plant into thinking it needs to shoot up its side branches in order to make sure it has tall enough and beautiful enough kola(s) to attract the male pollen for life production. All in all it works. Plus level canopy give ample even light to all buds because they are all approximately the same height absorbing the Same intensities