Talk:Princess Luna/@comment-4891854-20120911124551/@comment-4531340-20120911193748

I believe Faust said that her explanation was that the magic that transformed Nightmare Moon was too powerful, and so she had to be banished for 1,000 years to weaken it.

Also, the banishment lasted 1,000 years. Whether it was intended to or whether it was intended to continue for infinity is irrelevant.