No.....and yes the auditions are unlimted but in Hollywood the judges pick and then they chose the top 24 24 goes down to the top 20 then top 16 and the top 12 so basically its 12 in the semi-finals
The answer depends on what you consider an audition because the audition process starts with taking the test and doing well on the test. Links on the subject have been added under related links below...