> Protection lasts a decade or more, but health departments will have different ideas about when post-exp is necessary, and tend to lean towards public safety.

Titer every two years, except for the two opposite ends of the scale: those in labs researching rabies (every six months), and "Animal care professionals and others who frequently handle terrestrial mammals in regions without terrestrial rabies," i.e.: cavers (no titer checks). I believe that latter group is supposed to get a booster every three years.

Should be good for several years, such as in your case.

Source: knuckle-dragging, mud-eating caver.