public function getGraceTtl()
    {
        if (!isset($this->graceTtl)) {
            $this->graceTtl = self::DEFAULT_GRACE_TTL;
        }

        return $this->graceTtl;
    }
public function getGraceTtl()
    {
        if (!isset($this->graceTtl)) {
            $this->graceTtl = self::DEFAULT_GRACE_TTL;
        }

        return $this->graceTtl;
    }
public function getGraceTtl ( ) { if ( ! isset ( $ this -> graceTtl ) ) { $ this -> graceTtl = self :: DEFAULT_GRACE_TTL ; } return $ this -> graceTtl ; }
Gets grace period

@return int
Gets grace period