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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.
In a Long Course Meters pool (50 meters), the swimmer's mile is still 1500 meters--30 lengths or 15 laps (the longest race distance in this course) Open Water would be actual mileage! In the team goal, the miles we use are the swimmer's miles, so you should be dividing by 1650 for yards and 1500 for meters.