Hi there, considering your S's timeslot is a "PM one", I would count on at least 4 hours, may be even 5. CMU works with an "AM group" and a "PM group", and the total amount of people in each group varies from audition to audition date, which also ultimately dictates the total wait. Each group will typically be split up in two groups, one doing their dance audition first and the other doing their songs and monologues. The dance audition lasts about an hour. If your son dances first, and happens to be the first one in and out for his song/monologues he could be out in about 2 1/2 hrs (the song/monologues will likely take more than an hour depending on the # of kids to see and the availabilty of the faculty in 1, 2 or 3 rooms which varies as well, also, the first group doing their songs/monologues could very well not be finished); CMU tends to really take their time auditioning the song/monologue portion and so it would be a good thing to really allow yourself plenty of time. Good luck
