Six months on the original edge is pretty impressive. Nevertheless, I'd recommend touching them up long before they really need a major sharpening.
An analogy would be a straight razor. When you (finally) get one truly shave ready, you can keep them going with only minimal touch ups. Once they degrade past a certain point, you have to start all over againl. Same goes for knives.
An analogy would be a straight razor. When you (finally) get one truly shave ready, you can keep them going with only minimal touch ups. Once they degrade past a certain point, you have to start all over againl. Same goes for knives.