public function setRetentionTime($retentionTime)
    {
        if (! (is_int($retentionTime) || is_float($retentionTime))) {
            throw new \InvalidArgumentException(
                'Argument 1 must be of type int or float. Value is of type ' . gettype($retentionTime));
        }
        
        $this->retentionTimeWindow = $retentionTime;
    }