CREATE TABLE table_1180228_1 (num_of_discs VARCHAR, duration VARCHAR)

What is the total number of discs where the run time was 4 hours 40 minutes?
SELECT COUNT(num_of_discs) FROM table_1180228_1 WHERE duration = "4 hours 40 minutes"
SELECT COUNT("num_of_discs") FROM "table_1180228_1" WHERE "4 hours 40 minutes" = "duration"