I have watched multiple videos on youtube on how to refresh your straight. I am new to this, and im trying to save some money by not having to rehone all the time since i am a poor, recently graduated college student. Most people use chromium oxide to refresh their blades, however i have heard that it eventually stops working and you will have to move on to something like a naniwa 12k stone. My question is, for how long will the chromium oxide maintain a sharp blade?