Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_55 (minutes_played VARCHAR, points VARCHAR, opponent VARCHAR)

### Question ###
How many minutes were played when there were 18 points and the opponent was Chicago Bulls?

### Accurate SQL ###

SELECT COUNT(minutes_played) FROM table_name_55 WHERE points = 18 AND opponent = "chicago bulls"