I actually didn't grind much at all when I beat it recently. I did grind in the Sandsea at one point for LP. Gave everyone the thing that doubles LP and just walked around since I could kill everything in one hit while I had Netflix going. That was an hour at most.

My main party was definitely below level 60, but I can't remember the exact level I was. Everyone else was in their 20's and just popped out occasionally for a quickening chain. THere were a couple of tough fights, but it wasn't too troublesome for me! I may go back and try to do more of the hunts though. I really ignored a lot of that in the game.