CREATE TABLE table_16573 ("Character" TEXT, "Portrayed by" TEXT, "First appearance" TEXT, "Last appearance" TEXT, "Duration" TEXT, "Episodes" TEXT)

What was the duration of Robert Joy's portrayal?
SELECT COUNT("Duration") FROM table_16573 WHERE "Portrayed by" = 'Robert Joy'
SELECT COUNT("Duration") FROM "table_16573" WHERE "Portrayed by" = 'Robert Joy'