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A typical workout for a series competitive swimmer might be between 8000-10000 yards in a 2 hour period, or 320-400 25-yard laps in 2 hours. A beginning obviously will be substantially less.
1 Those bursts of speed may last 30 seconds to a minute. After each interval, slow down and let your heart rate come back down.  Swimming: Swim a length, rest for 30 seconds, swim another length, and repeat until you've swum six lengths, suggests Guy Edson, technical director of the American Swimming Coaches Association.