User blog comment:FairyRaven/Fairy Tail Chapter 424: Avatar, Review and Commentary/@comment-24.90.189.198-20150316160334/@comment-87.202.70.255-20150316185015

It should not be more than 3 weeks. Also, f. Rogue said that frosch death was the event responsible for him being absorbed by the shadows. So Rogue can still become f. Rogue without the dragons interfering. It was never said how and when Acnologia ruled the world and it wasn't bc of this that rogue turned that way.