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var findPoisonedDuration = function (timeSeries, duration) {
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  let totalTime = duration;
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  for (let i = 0; i + 1 < timeSeries.length; i++) {
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    let diff = timeSeries[i + 1] - timeSeries[i];
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    totalTime += diff > duration ? duration : diff;
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  }
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  return totalTime;
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};