You don't have to mindlessly zerge Fates none stop. It is really boring after awhile, and to me it isn't even that fast since you have to compete to get reward and with popular area you will get very little or nothing to no reward because it end so fast.

What you do is get a group of Friends together, or join a large FC and just repeat the Dungeon a few time with 3% Foods and Chain the Mob in the Dungeon for some really sweet exp. DPS don't have to be fantastic, but it does help if you have Blackmage and Bard with some decent gears.

You rack up some nice exp and level up in no times, and by the time you done with that Dungeon you get your whole gear set and ready for the next one.