Just like everything else, it depends. It depends on your body type, how long and how often you are running, what type of climbing you are training for, how hard you are climbing, your baseline level of fitness.
I think Tank is right on the money with his post. I would add that I seem to remember and interview with Tommy Caldwell where he mentioned he ran somewhere around 60-70 miles a week un top of climbing. If he ran much more he felt weak on the rock.
As far as running for weight loss, there are much better things you can do than run 30 miles a week to drop a few pounds. There is better cardio you can do as well.
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