Today. Day 38I use binder clips on the edge of the pot with pipe cleaners to LST - if the stem is a bit thick, I roll it between my thumb and two fingers to soften up the fibre a bit to make it easier to bend. If ya accidentally partially break a stem, I've used duct tape a few times to mend it and that works.
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And day 35 of my current CK -started lst around day 21 if i recall right. Just to open the plant up a bit for better light
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I came at her a little harder and tied down some more branches since she recovered so well.
When would I want to stop tying them down? I've heard that they can get rigid during flower.