However, if we compare the two through calories burned we find a fast swim for an hour is equal to running at 6mph for an hour given the same body weight.
Source: http://www.nutristrategy.com/activitylist3.htm
Generally speaking, a human can swim about 1/4 the speed that they can run the same distance. For instance, the 100m sprint world record is about 10 seconds, while the 100m freestyle record is 46 seconds. The 1 mile running record is 3:43 (223 seconds), while the 1500m swim record is 14:34 (874 seconds). So, a 1 mile run would equal about a 400m swim, in terms of time and roughly effort required.
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1500m or 1650yds. In a long course meter pool its 30 lengths, in a short course yard pool its 66 lengths.