Name the total number of air dates for 102 episode
CREATE TABLE "table1_15584067_7" (
  "no_in_series" text,
  "no_in_season" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);
SELECT COUNT("original_air_date") FROM "table1_15584067_7" WHERE "no_in_series"='102';