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_26198709_1 (original_air_date VARCHAR, us_viewers__million_ VARCHAR)
### Question:
How many air dates does the episode with 15.50 million viewers have? 
### Answer:
SELECT COUNT(original_air_date) FROM table_26198709_1 WHERE us_viewers__million_ = "15.50"