How long should I do LST ?

I do LST throughout the grow. Plants constantly need training to keep light coverage at an optimal level.

I start LST when the plant is big enough and continue until harvest. If you establish the plant's shape early enough the stems will harden and you can usually remove most or all ties about half way through flower. Sometimes though I will come back later and put a few ties back on just to make sure all bud sites get as much light and airflow as possible.

You can train all the way through to maintain the shape and height you desire.

You can stop when your plant has the desired shape.plant will stretch during first few weeks of flowering,youll see a difference in its shape. İf your plant has a good canopy,almost even,it is a good lst. Yours looks good to me. There is no deadline for lst,you can even do it in flowering.it is a basic training which in return brings better buds. Thats a little bit of experience.just give it the shape you want and watch it in flowering.note how much it stretches and exercise it next time again.