How many coals..

I usually started off with 2 coco nara coals for each hookah session I do. I'm going to go pick up some Nakhla and try it for the first time. I was wondering if you guys prefer 2 coals or 3. I use a vortex bowl. I have heard that 3 will burn it faster and all that, but anyone with experience with Nakhla, let me know what you think! thanks