Looks like it is more common for dances are more common. If I don't remember wrong, I tested all 6 pre-Bronze and Bronze dances in one session (that was more than 10 years ago!).
Last year, I tested Adult pre-Bronze Free, Adult Bronze Moves & Free and Adult Silver Moves & Free in one session. 5 tests, and a ton of contingencies, and I was pooped at the end of it!