User blog comment:ILuvAnime/Fairy Tail continue after episode 175/@comment-75.176.92.182-20130625195305/@comment-7418318-20130625201644

The absolute (semi)worst case (meaning the re-run shows ALL 175 episodes) is a little over 3 years from now.

"Semi" because that case assumes that the new episodes will start right after the re-run finishes, which is not garantueed and because there is also the possibility that the plans for new episodes get canceled. Unlikely as it is, it's still a possibility.