CREATE TABLE table_name_61 (year VARCHAR2, color_commentator_s_ VARCHAR2)

For how many years combined were Frank Gifford and Dan Dierdorf color commentators?
SELECT COUNT(year) FROM table_name_61 WHERE color_commentator_s_ = "frank gifford and dan dierdorf"
SELECT COUNT("year") FROM "table_name_61" WHERE "color_commentator_s_" = "frank gifford and dan dierdorf"