Minimal. The odd bit. We'll pull them through the trellis as optimally as we can but essentially the plants train themselves to an extent. We had a beautiful beautiful Bruce Banner holding up about 4 plants last grow. Shame & Co neamed it by mistake in full flower! In the commercial grows I see, either on Cannacribs (channel on YouTube, great to while away a few hours, some lovely personal stories there as well as the grow operations) or sent to me by the light manufacturers no one really trains. Just too labour intensive and I suspect the labour/yield doesn't work.
That's a farm called OG Yields - not watched this episode yet - I don't think they even top? Looks like single cola plants to me?