<p>I believe the schools that ask you to set aside 4 hours are the schools that included some sort of group audition/ warm-up as part of the audition. Those who have attended Unifieds in the past can chime in more specifically, but if a school is asking you to set aside that much time it is likely that the audition will be more than a 20 minute audition/ interview. There are quite a few threads about Unifieds here and on the MT Forum. If I am remembering correctly I think it is difficult to impossible to do more than about 4 auditions in 1 day?</p>