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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.
The distance in one lap of swimming depends on which pool one is in. Competitive swimmers consider one lap to be one length. In the US, there are three types of pools used for competition. The first is called a 25 yard pool. It is 25 yards and is generally used in high school swimming and in club swimming during the winter season.