How many days are associated with production code 210?
CREATE TABLE table_20906 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text,
    "Production code" real
)
SELECT COUNT("Original airdate") FROM table_20906 WHERE "Production code" = '210'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many days are associated with production code 210? ### Input: CREATE TABLE table_20906 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text,
    "Production code" real
) ### Response: SELECT COUNT("Original airdate") FROM table_20906 WHERE "Production code" = '210'