what of the total number of date where grand prix is portuguese grand prix
CREATE TABLE table_1137704_2 (date VARCHAR, grand_prix VARCHAR)
SELECT COUNT(date) FROM table_1137704_2 WHERE grand_prix = "Portuguese grand_prix"
### Context: CREATE TABLE table_1137704_2 (date VARCHAR, grand_prix VARCHAR) ### Question: what of the total number of date where grand prix is portuguese grand prix ### Answer: SELECT COUNT(date) FROM table_1137704_2 WHERE grand_prix = "Portuguese grand_prix"