The only way to insure that a program will not run over time is to use a stopwatch and time the program. My advice is to buy a cheap electronic stopwatch and check the time yourself. This can only be done when the music is being played on the specific equipment that will be used during the competition. It is also wise to mark the actual music run time desired on each cassette, so that the music technician will be alerted if there is a problem. Remember, a tape that is within the time limit using your or your coach's equipment may not be within specification on the equipment used for competition.
Music is as important to a skater's success as are properly sharpened skate blades.
Don't let a mistake or an oversight cast a shadow over a year of hard work.