Tough question, but here is a reasonable answer, most people can't swim 800m nonstop without a few weeks of training, average times for 800m will vary by a lot, three historical world records; {| |- | 11:25:04 Henry Taylor Saturday, July 21, 1906 Runcorn, United Kingdom 09:35.5 Hironoshin Furuhashi Friday, August 19, 1949 Los Angeles, USA 7:23:42 Grant Hacket Saturday, July 19, 2008 Melbourne, AUS A good traiathlete will be able to do it in under 13 minutes. |} Tough question, but here is a reasonable answer, most people can't swim 800m nonstop without a few weeks of training, average times for 800m will vary by a lot, three historical world records; {| |- | 11:25:04 Henry Taylor Saturday, July 21, 1906 Runcorn, United Kingdom 09:35.5 Hironoshin Furuhashi Friday, August 19, 1949 Los Angeles, USA 7:23:42 Grant Hacket Saturday, July 19, 2008 Melbourne, AUS A good traiathlete will be able to do it in under 13 minutes. |}
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There are many variables that affect it. One variable is how fast your body uses calories. I would estimate about 500.