The actual conversion is always a little fishy IMO, because depending on the swimmer's individual strengths and weaknesses, a converted time from short-course swimming might never be attainable in long course (and vice-versa). Conversions are basically something we can't accurately determine, because short course and long course swimming are two entirely different things when discussing something like the 50.
In terms of what we actually can determine though, 18.69 for a 50y swim means that his average speed (in terms of miles per hour... or km/hr for you weirdos) qualifies him as the fastest human being ever to swim a measured, timed race from a flat start.
It's pretty unreal.
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