9 swings is the max I think. Most timed nodes are 6 hits. And can get +2 attempts on those. Plus spend 300 gp for a 9th attempt. Paired with blessed harvest 2 this is my favorite way of getting hq mats. As you can get 4 swings of guaranteed 100% hq

Using kings yield 2 you could possible get 24 adamantit or luminous ore or something from a single node if it procs with +2attempts