CREATE TABLE table_203_639 (id DECIMAL, "year" TEXT, "number" TEXT, "name" TEXT)

how long was w.b. kingsmill club president ?
SELECT "year" - "year" FROM table_203_639 WHERE "name" = 'w.b. kingsmill'
SELECT "year" - "year" FROM "table_203_639" WHERE "name" = 'w.b. kingsmill'