CREATE TABLE table_24120 ("Episode" TEXT, "Broadcast date" TEXT, "Run time" TEXT, "Viewers  ( in millions ) " TEXT, "Archive" TEXT)

What is the run time for the episode with 7.9 million viewers?
SELECT "Run time" FROM table_24120 WHERE "Viewers (in millions)" = '7.9'
SELECT "Run time" FROM "table_24120" WHERE "Viewers (in millions)" = '7.9'