How many millions of viewers were there for the episode with a run time of 18:00?
CREATE TABLE table_20490 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
)
SELECT "Viewers (in millions)" FROM table_20490 WHERE "Run time" = '18:00'
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 millions of viewers were there for the episode with a run time of 18:00? ### Input: CREATE TABLE table_20490 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
) ### Response: SELECT "Viewers (in millions)" FROM table_20490 WHERE "Run time" = '18:00'