With montage editing, the informal dancing footage would be edited into a music video. The length of this segment ranges based on the amount of dancing at your event, but it is typically between 5-10 minutes long. This is a great way to see everything that happened without needing to fast forward or skip around.
With traditional editing your informal dancing would play back in real time, and you would hear the music that your band or DJ was playing. Depending on the amount of dancing at your event, the total length of dancing could be closer to one hour long. Traditional editing is usually recommended for those that are looking for a longer video.