What's the total number of directors whose episodes have been seen by 9.14 million viewers?
CREATE TABLE "table1_12919003_3" (
  "num" real,
  "episode" text,
  "writer" text,
  "director" text,
  "viewers_millions" text,
  "original_airdate" text
);
SELECT COUNT("director") FROM "table1_12919003_3" WHERE "viewers_millions"='9.14';