public function getUnboundedLabel($oldLabel, $lowerBound)
    {
        if ($lowerBound < 60) {
            return sprintf($this->labelSecondsPlural, $lowerBound);
        } else {
            // since we're using minutes, we use floor so 1801s+ will be 30m+ and not 31m+
            return sprintf($this->labelPlural, "" . floor($lowerBound / 60) . urlencode('+'));
        }
    }