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Chester P Squeeb
RE: Run a 1k time trial. That's your marathon time. Change my mind!
My best 1000 metre time trial: 3:34
My PR in a marathon: 3:32

But my 1km time trial was on a flat track, low wind, and around 10 deg Celsius whereas the marathon had a total elevation gain of 200 metres on a warm, humid and windy day. I suspect I could do far better in a marathon if I had ideal conditions on a race day but you run in whatever conditions exist on the day of the race.

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