How many different dates are there for founded teams for the venue of champion window field?
CREATE TABLE table_name_77 (founded VARCHAR, venue VARCHAR)
SELECT COUNT(founded) FROM table_name_77 WHERE venue = "champion window field"
### Context: CREATE TABLE table_name_77 (founded VARCHAR, venue VARCHAR) ### Question: How many different dates are there for founded teams for the venue of champion window field? ### Answer: SELECT COUNT(founded) FROM table_name_77 WHERE venue = "champion window field"