A good estimate would be 44. 17*1.61*1.61. In actual fact I have 55 parkruns within a 55 km radius, so slightly more spread out that the 17 mile radius which includes a couple of large cities.
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A good estimate would be 44. 17*1.61*1.61. In actual fact I have 55 parkruns within a 55 km radius, so slightly more spread out that the 17 mile radius which includes a couple of large cities.