When is the right time to remove LST clips?

The plant will attempt to move stems around how it wants to until mid flowering where it no longer is interested in growing stem material, and the amount of correction it will attempt is minimal. You'll notice the tops of the plant are flexible, more than older growth. Older growth hardens and resists change. So when your area being trained by a clip or wire has aged, it will more or less stay in that bend. Its an age thing. Which varies from plant to plant so there is no set time. If it has new growth above that trained area and its been there 3, 4 weeks, its going to stay and you can take the clip off for sure. You can always take the clip off, see what happens, and put it back later if needed. Don't over think it. Just roll with it. You'll be training the next ones too, but it will make more sense and be easier to make decisions as you watch and observe the plants. Nothing wrong with asking, but also try some stuff and watch patiently to see. Its the best teacher. I use gardening wire. Maybe try that too for some situation. I love it.