CREATE TABLE table_15116 ("Title" CLOB, "Length" CLOB, "Writer" CLOB, "Director" CLOB, "Airdate" CLOB)

The length of 30 minutes aired on what date?
SELECT "Airdate" FROM table_15116 WHERE "Length" = '30 minutes'
SELECT "Airdate" FROM "table_15116" WHERE "Length" = '30 minutes'