My avatar is 65, with SS, Divine and passive of axe and LS using full set of Luo Han Armor. The damage that my avatar can give is barely around 400-500 with Brutish Edge+2 (Wind lvl 2) even with Shield Breaker and Daredevil Stance.
I use Kara as my healer...even though originally I have Yulie as bow healer, but she's on lvl 65 so I prefer using Kara to lvl her up. Currently she's on 63 using full set of Sword Mage Armor
3rd member is Eldore as LS/Divine/Elemental. The best he can do is around 1k damage using Electrocution. But I let him use Anubis Staff and full set of Bai Hu armor.
This took me around 6-7 mins to finish Arena II or 8-9 mins for OGIT III.