Lol, John, my statements are somewhat contradictory! It's like everything in bonsai: "It depends"!
Let me clarify: once the tree is refined and balanced, it takes a small amount of work periodically to maintain. But trees are always growing, and they will need to be cut back, old wire removed, new wire placed, to rejuvenate the design. Due to the amount of ramification most refined trees have, this rejuvenation is usually a significant effort. The frequency of the rejuvenation required is largely species defendant. The faster growing species needing work more often than slower growing ones.
Let me clarify: once the tree is refined and balanced, it takes a small amount of work periodically to maintain. But trees are always growing, and they will need to be cut back, old wire removed, new wire placed, to rejuvenate the design. Due to the amount of ramification most refined trees have, this rejuvenation is usually a significant effort. The frequency of the rejuvenation required is largely species defendant. The faster growing species needing work more often than slower growing ones.