This depends solely on the conditions they are flying in. If there are pockets of warm air (which rises) the hang glider pilot can recognize this fact (by looking at cloud patterns) and get some lift by guiding the glider into the right updrafts. I researched this before when I was teaching a science course on it; if memory serves me right the world record for distance and time was about 4 hours or so. I think the guy made it more than one hundred miles too (all without a motor—amazing)— I remember his average speed was about 19 or 20 miles per hour!
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