text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_25246990_5 (original_us_air_date VARCHAR, us_viewers__millions_ VARCHAR)
  ### Question:
  How many different original U.S. air dates appear where the U.S. viewers were 2.5 million?
  ### Answer:
  SELECT COUNT(original_us_air_date) FROM table_25246990_5 WHERE us_viewers__millions_ = "2.5"