CREATE TABLE table_204_749 (id DECIMAL, "courthouse" TEXT, "city" TEXT, "street address" TEXT, "jurisdiction" TEXT, "dates of use" TEXT, "named for" DECIMAL)

how long has the city of brattleboro 's courthouse been in use ?
SELECT "dates of use" - "dates of use" FROM table_204_749 WHERE "city" = 'brattleboro'
SELECT "dates of use" - "dates of use" FROM "table_204_749" WHERE "city" = 'brattleboro'