How many weeks are shown for the champion of john mcenroe 6 2, 6 3?
CREATE TABLE table_21584646_10 (
    week_of VARCHAR,
    champion VARCHAR
)
SELECT COUNT(week_of) FROM table_21584646_10 WHERE champion = "John McEnroe 6–2, 6–3"
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 weeks are shown for the champion of john mcenroe 6 2, 6 3? ### Input: CREATE TABLE table_21584646_10 (
    week_of VARCHAR,
    champion VARCHAR
) ### Response: SELECT COUNT(week_of) FROM table_21584646_10 WHERE champion = "John McEnroe 6–2, 6–3"