To tell how many calories you would burn you would have to know how hard you are going to swim it. If you are just floating around and gliding, you wouldn't burn many calories. If you were swimming hard (continuously, flip turns included) you would be burning more.
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A 55 kilogram person swimming 2700 meters in an hour with the front crawl will burn 479 calories. This varies depending on pace and weight.
Approximately 500 to 556 calories you are burning if you swim 2000 meters in 75-80 minutes.