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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.
During aerobic exercise your body's demand for oxygen can be met and your intensity sustained. Any exercise you can maintain for more than two minutes will be aerobic. Aerobic swims are those that are longer in distance and duration. These swims are performed at an easy to moderate pace. Using the Borg Rating of Perceived Exertion scale, which measures physical intensity for a given effort on a scale of 6 to 20, an aerobic swim would fall somewhere between 7 and 13.