What exactly is it that you are disagreeing with? The pacing is different because of the duration. The actual time it takes is a consequence of many more factors than your pacing, but successful pacing depends on duration. For a more refined example, someone who is capable of a 2h20m bike split at .9 IF should probably ride slightly easier and target 2h25m or so; but if that same .9 IF might enable a 2h3m bike split, then it’s a lot more plausible.
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