1. How Long We're Calms? Was it ever explicitly stated?

2. What do you think happened to the temples after Sin and Yu Yevon were gone? My guess, just used to honor great summoners. You think they may have torn them down?

3. If all aeons were necessary to complete the journey, why was Anima not needed even though Seymour summons it. I Understand Magus and Yojimbo were optional for gameplay challenges, but Anima is shown in an important scene during the blitzball tourney.