This is mathemagically determinable, depending upon the node itself and whether or not you have the GP to use specific abilities.

I think the most it is possible in game to get from any one node though, would be the Rock Salt from an Unspoiled Node in La Nosce somewhere (same zone as Costa, but other section). You get 6 swings, of which one must be eaten to clear the obstruction, and 5 yield per swing. Add Kings Yield 2 to bring it to 7 per swing, then add that one 200 GP ability that adds 1 to your yield for the next swing only. The total take : 36 per visit to the node, at 700 GP.

Bear in mind, too, that some nodes can offer you +1 or +2 swings. That will significantly affect your take on that particular visit to the node.