.b.UnitPrefixScale.METRIC.MILLI, tr.b.UnitPrefixScale.METRIC.NONE);
    const windowSizeSeconds =
        4 * Math.exp(- timeCoefficient * timeSinceSearchBeginSeconds) + 1;
    return tr.b.convertUnit(windowSizeSeconds,
        tr.b.UnitPrefixScale.METRIC.NONE, tr.b.UnitPrefixScale.METRIC.MILLI);
  }

  /**
   * TaskCluster represents a group of long tasks such that they are at least 1s
   * away from any other long task that is not in the group.
   *
   * A TaskCluster instance is meant to be immutable onc