What was the date of the race that lasted 6 hours?
CREATE TABLE table_74920 (
    "Race" text,
    "Class(es)" text,
    "Length/Duration" text,
    "Circuit" text,
    "Date" text
)
SELECT "Date" FROM table_74920 WHERE "Length/Duration" = '6 hours'
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: What was the date of the race that lasted 6 hours? ### Input: CREATE TABLE table_74920 (
    "Race" text,
    "Class(es)" text,
    "Length/Duration" text,
    "Circuit" text,
    "Date" text
) ### Response: SELECT "Date" FROM table_74920 WHERE "Length/Duration" = '6 hours'