On how many dates did the Michigan International Speedway hold a round?
CREATE TABLE table_10725629_2 (date VARCHAR, circuit VARCHAR)
SELECT COUNT(date) FROM table_10725629_2 WHERE circuit = "Michigan International Speedway"
### Context: CREATE TABLE table_10725629_2 (date VARCHAR, circuit VARCHAR) ### Question: On how many dates did the Michigan International Speedway hold a round? ### Answer: SELECT COUNT(date) FROM table_10725629_2 WHERE circuit = "Michigan International Speedway"