On how many different dates was the race at the Silverstone circuit?
CREATE TABLE table_22334183_3 (date VARCHAR, circuit VARCHAR)
SELECT COUNT(date) FROM table_22334183_3 WHERE circuit = "Silverstone"
### Context: CREATE TABLE table_22334183_3 (date VARCHAR, circuit VARCHAR) ### Question: On how many different dates was the race at the Silverstone circuit? ### Answer: SELECT COUNT(date) FROM table_22334183_3 WHERE circuit = "Silverstone"