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You need to look at Naismith's Rule! http://en.wikipedia.org/wiki/Naismith%27s_Rule A rough guide is that every 1000ft if ascent adds 1.5 - 2 miles to the effective distance. Example Fairfield horseshoe (Lakes) distance 10.5 miles. 3500 ft of ascent (give or take) effective distance 17.5…