CREATE TABLE table_20305 ("Episode" TEXT, "Broadcast date" TEXT, "Run time" TEXT, "Viewers  ( in millions ) " TEXT, "Archive" TEXT)

What date was an episode with a run time of 24:30 broadcasted?
SELECT "Broadcast date" FROM table_20305 WHERE "Run time" = '24:30'
SELECT "Broadcast date" FROM "table_20305" WHERE "Run time" = '24:30'