CREATE TABLE table_203_577 (id DECIMAL, "tenure" TEXT, "coach" TEXT, "years" DECIMAL, "record" TEXT, "pct." DECIMAL)

what number of years did d.v. graves serve ?
SELECT "years" FROM table_203_577 WHERE "coach" = 'd. v. graves'
SELECT "years" FROM "table_203_577" WHERE "coach" = 'd. v. graves'