Nobody likes to take breaks during battles. They are always way too long. The dancers never want to take breaks. Normally, the time between battles is long enough to catch a breath. There are just two reasons you should take a break during a battle.
You should take a break when your judges need a break. They actually have to stay concentrated the whole time and that can be difficult. They also need some time to eat something.
You also need a break between the preselection and the battles. Obviously, the judges need the time to properly select the people who get into the battles. Every other break should be way shorter.