When 7.08 is the amount of viewers how many directors are there?
CREATE TABLE "table1_24781886_3" (
  "total" real,
  "num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "viewers" text,
  "air_date" text,
  "production_code" real
);
SELECT COUNT("director") FROM "table1_24781886_3" WHERE "viewers"='7.08';