Well the barbell should be long enough so you can push your hand against your ear and flatten out the cartilage and it should still feel comfortable, like laying down and putting your head on a pillow. You should not feel the barbell pulling on your ear cartilage, if it does then you should go see your piercer and explain that the barbell is too short for reasonable and comfortable wear. If they are a good shop they will get it squared away for you without any hassle.
Industrial Light and Magic Creating the Impossible - 2010 TV is rated/received certificates of: USA:TV-PG
Piercing I - 2010 is rated/received certificates of: Singapore:NC-16
The Impossible Murder - 2010 is rated/received certificates of: India:UA
Impossible Orchestra - 2013 is rated/received certificates of: Australia:G
Mr- Impossible - 1994 is rated/received certificates of: Belgium:KT
Dinner Impossible - 2007 is rated/received certificates of: USA:TV-G
Hotel Impossible - 2012 is rated/received certificates of: USA:TV-PG
The Impossible Possum - 1954 is rated/received certificates of: USA:TV-G
Impossible Creatures - 2002 VG is rated/received certificates of: USA:T
Mission Impossible - 1998 VG is rated/received certificates of: USA:T
Mission Impossible - 1991 VG is rated/received certificates of: USA:E
Work and Change Industrial Democracy - 1985 is rated/received certificates of: Australia:G