I agree with zoo after it hits its 4th node than it can be LST'ed anything before that there really is no point, because the plant is getting all the light it can get anyway. The point of LST'ing is so that when you are flowering there can be multiple main colas and more budsites will get more light which increases yield. This enables you to grow a small plant without sacrificing yield and conserving space.
dkmonk
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