If your razor was correctly sharpened once you should be able to maintain it
on a coticule and slurry stone for a long time. The slurry stone is optional...
Rinse the coticule with clear water and rub any dusty bits off that may have settled
and give it five up/down hone strokes once a week. For a home shaver you only need
to lap the hone close to flat once... A little bit of dishing (half the thickness of a dime or less)
will give a micro bevel that some like me like. Others will not tolerate it.