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_23157997_13 (stage VARCHAR, general_classification VARCHAR)

### Question ###
What stage number had the general classification Rory Sutherland?

### Accurate SQL ###

SELECT COUNT(stage) FROM table_23157997_13 WHERE general_classification = "Rory Sutherland"