Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### 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"