What was the duration of Robert Joy's portrayal?
CREATE TABLE table_16573 (
    "Character" text,
    "Portrayed by" text,
    "First appearance" text,
    "Last appearance" text,
    "Duration" text,
    "Episodes" text
)
SELECT COUNT("Duration") FROM table_16573 WHERE "Portrayed by" = 'Robert Joy'
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 duration of Robert Joy's portrayal? ### Input: CREATE TABLE table_16573 (
    "Character" text,
    "Portrayed by" text,
    "First appearance" text,
    "Last appearance" text,
    "Duration" text,
    "Episodes" text
) ### Response: SELECT COUNT("Duration") FROM table_16573 WHERE "Portrayed by" = 'Robert Joy'