What is number 21's highest time?
CREATE TABLE table_61368 (
    "Number" real,
    "Time" real,
    "Aircraft" text,
    "Opponent" text,
    "Location" text
)
SELECT MAX("Time") FROM table_61368 WHERE "Number" = '21'
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 is number 21's highest time? ### Input: CREATE TABLE table_61368 (
    "Number" real,
    "Time" real,
    "Aircraft" text,
    "Opponent" text,
    "Location" text
) ### Response: SELECT MAX("Time") FROM table_61368 WHERE "Number" = '21'