During Eugene Cernan and Jack Schmitt's second moonwalk during Apollo 17, they used their moon rover to go five miles away from the lunar module, the furthest any human being has been during an EVA from their spacecraft. If the rover had broken down, NASA had calculated that Cernan and Schmitt had enough oxygen and cooling water in their spacesuits to walk back to the lunar lander if they averaged a speed of 1.7mph.
Source: Air & Space Smithsonian, July 2009. "Step Outside: How Humans Learned to Walk in Space" by Tony Reichhardt, p35.
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