I want to say the number was somewhere in the 60s, but I ran WoD every week, and then ran it as part of the upgrade mats quest every week, and then helped friends with it and used it for tomes, on top of just random runs in hoping to get the healer coat. To this day I only ever saw the coat drop once, and I was beaten in rolls by a WHM who was doing next to nothing the entire run. I have given up on the item and decided I hate how it looks aesthetically. Haha.