User blog comment:FairyRaven/Fairy Tail Chapter 335: The Time of Life, Review and Commentary/@comment-4829046-20130614115508/@comment-7418318-20130614125950

It took seven years to charge the gate in secret.

If they no longer need to keep it secret, they might be able to charge up faster, especially with all that magical energy set free in this massive battle.

Also the allied Dragon(s) might help in the charging.

So I wouldn't count the possibility of it being used "right away" again out just yet.