It is not that hard on a 99/99 WAR at least.
I did it earlier with relative ease and 5mins 30sec remaining. All you have to do on the boss is bait the puddles along the edge and go in the middle for fear itself as soon as he drops the 4th one, then rinse and repeat for the entire fight. He hits harder than the floor 30 version because of the cleave and the cast for fear itself is shorter but aside from the that its the same thing.
With the load of potions you get and self heals, its doable.
I can't speak for the later floors yet ( will try 131-140 solo tonight )
