User blog comment:FairyRaven/Fairy Tail Chapter 335: The Time of Life, Review and Commentary/@comment-15267891-20130614195935

Ultear's sacrifice is not worthless. It managed to save a few lives in that span of 1 minute. If she managed to turn back time before the gates are opened then this arc is endless 'cause the events may just repeat.

I think that by the end of this arc, the Tenrou group (21 people) will return to X784.