User blog comment:FairyRaven/Fairy Tail Chapter 389: The Twin Dragons vs. The King of Hades, Review and Commentary/@comment-98.218.131.180-20140620180748/@comment-108.28.233.191-20140621063758

@NoNickNeeded

To the contrary, I would not be surprised if a month or two was intended to have passed between chapter's 340 and 341. Lines like "But ever since the Grand Magic Games, we've been deluged with job requests!", "We're so busy it makes me dizzy!", "But we need to take it easy once in a while for our health." and so forth do not sound much like they're meant for a period of time measured in 3-4 days since they returned from Crocus to Magnolia (3 days being the period of time since Gray and Natsu had left on a job).

So it'd be quite easy for as much as three months to have passed from the end of the GMG, to current time.