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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.
If you want to swim for 30 minutes, divide 30 minutes by your average lap time to determine how many laps you need to swim. For example, if you swim a lap in 45 seconds, you need to swim about 67 laps to complete a 30-minute workout.