Divide your score into 3 separate tracks/mixes
well at my old music publishing company they used to require artists to submit a full mix of the score an acappella mix and an instrumental mix. Usually in the project description it will list the appropriate time for each mix but they're usually fairly short at around 30-60 seconds. If you need additional help you might be able to get additional help at Fast Break Music Licensing, their blog is pretty informative and they usually respond pretty quickly to film/tv questions.