DPS DF duty finder queue is 30 minutes and then you only get one run before back to the 30+ min queue.
So if you make your own group that can do multiple runs, I'm sure the time invested works out more evenly.
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Main reason you want a brd is for the final fight. The bard will run around killing up to a maximum of 4 tonberries. It's easiest to use ranged dps so that lessons chance that your going to get hit plus having aoe helps a hell of a lot during the dungeon. A Blm is also good because they can sleep the mobs meaning less hits on the tank and an easier run.