i have about 22 cord cut and stacked i guess after this heating season i will have an idea how much i will need each year
depends a lot on the year...how well seasoned your wood is..what type of wood you have (btu's can differ greatly in different wood by the cord)
and of course how well insulated your underground pipes are and how far your stove is from your house
if this your first year with your stove..dont be afraid to let it burn down...i think a lot of new users (me included) fired the stove the first year or more way too often...most stoves should get by on 2 fills a day or three or four small ones
if i am home and working around the shop on a saturday i try and get by with no filling all day..i just turn the coals ever couple of hours untill the fire is almmost used up...then i fill er up for the night
there will be a learning curve that you need to go through in order to become "in tune with your stove"