Does LST ever stop?

I stop around 4 week of flower but depends on how much stretch it takes on.

The answers you are looking for are very subjective. You can do as much, or as little, LST as you like. Also, you can stop whenever you like. You probably don’t want to be doing much training in late flower when the branches become more rigid. Also, I looked at your diary. If you’re really on week 9, I’d recommend switching your lights to 12/12. With an auto you should be closer to harvest by week 9 than to preflower (you’re not in flower yet). I’ve had this happen before myself. The good news is she’ll be a monster plant when she’s done!