CREATE TABLE "episodes" (
  "title" text,
  "length" text,
  "writer" text,
  "director" text,
  "airdate" text
);

Question: The length of 30 minutes aired on what date?
SQL: SELECT "airdate" FROM "episodes" WHERE "length"='30 minutes';

Question: When did the length of 60 minutes air?
SQL: SELECT "airdate" FROM "episodes" WHERE "length"='60 minutes';