function convertToHours()
    {
        $totalMinutes = $this->minutes;
        $Mins = ($totalMinutes % 60);
        $Hours = floor(abs($totalMinutes) / 60);
        if ($totalMinutes < 0) {
            $Hours = '-' . $Hours;
            $Mins = substr($Mins, 1);
        } else {
            $Hours = floor($totalMinutes / 60);
        }
        $Mins = str_pad($Mins, 2, '0', STR_PAD_LEFT);
        $this->HM = new HM($Hours, $Mins);

        return $this;
    }