Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_61 (year VARCHAR, color_commentator_s_ VARCHAR)

### Question ###
For how many years combined were Frank Gifford and Dan Dierdorf color commentators?

### Accurate SQL ###

SELECT COUNT(year) FROM table_name_61 WHERE color_commentator_s_ = "frank gifford and dan dierdorf"