CREATE TABLE table_203_89 (id DECIMAL, "#" DECIMAL, "name\ ( birth-death ) " TEXT, "took office" TEXT, "left office" TEXT, "monarch" TEXT, "prime minister" TEXT)

which governor general served the longest term from 1910 to 1961 ?
SELECT "name\n(birth-death)" FROM table_203_89 ORDER BY JULIANDAY("left office") - JULIANDAY("took office") DESC LIMIT 1
SELECT "name\n(birth-death)" FROM "table_203_89" ORDER BY JULIANDAY("left office") - JULIANDAY("took office") DESC NULLS LAST LIMIT 1