Autoflower low stress training

Tonight I started LST on my sour Diesel and my northern lights strains but I’m not sure how long do I keep them tied down in one position? Once I untie them how soon would I tie it down in I different direction if needed?
Any suggestions would be great

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I leave them tied until the stems have hardened off in place. They will try to revert to natural growth pattern if you don’t. As a branch grows, you may need another tie to maintain the spread. The first may be removed at that point.