How many weeks has the opponent been san francisco 49ers?
CREATE TABLE table_name_65 (week VARCHAR, opponent VARCHAR)
SELECT COUNT(week) FROM table_name_65 WHERE opponent = "san francisco 49ers"
### Context: CREATE TABLE table_name_65 (week VARCHAR, opponent VARCHAR) ### Question: How many weeks has the opponent been san francisco 49ers? ### Answer: SELECT COUNT(week) FROM table_name_65 WHERE opponent = "san francisco 49ers"