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 actor ( Actor_ID int, Name text, Musical_ID int, Character text, Duration text, age int )
TABLE: CREATE TABLE musical ( Musical_ID int, Name text, Year int, Award text, Category text, Nominee text, Result text )

### Question ###
Calculate the number of actors in each duration of actors using a bar chart, could you list X-axis in desc order please?

### Accurate SQL ###

SELECT Duration, COUNT(Duration) FROM actor GROUP BY Duration ORDER BY Duration DESC