When you write "Apart of your performance piece may be cut because of time constraints" (see here: http://www.tipc.jp/4th/english_guideline06.html ), do you mean, that repeats are at the discretion of the performer or something else?

A10.
For Round 1 and 2, your performance time is specified. If your performance is longer that, it may be stopped. However, the repetition is at your discretion.