Many people use a finishing hone to refresh the edge. At x number of shaves you may do 10 laps on the hone. This will vary person to person but the premise is the same. Done like this as long as not damaged you can continue like this for years.

Once you have been shaving a while and truly understand shave ready then try some sharpness tests and calibrate them to yourself. That is when they start to mean something and are useful