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_17085981_2 (date_of_appointment VARCHAR, replaced_by VARCHAR)

### Question ###
How many appointment dates were recorded when Jürgen Kohler was the replaced by?

### Accurate SQL ###

SELECT COUNT(date_of_appointment) FROM table_17085981_2 WHERE replaced_by = "Jürgen Kohler"