60 mg prednisone is the standard for acoustic trauma as far as I know. Maybe you are thinking of Prednisolone or Dexamethosone which I believe requires less? Here is one study of many citing that figure.Where did you get the 60 mg Prednisone from? Is that one tablet or multiple... I was not aware of this dosage.
Ken
Oral steroid regimens for idiopathic sudden sensorineural hearing loss