Debtor_GetInvoices

I would like to know the best practise on how to handle large data ex.

    try
    {    
        $InvoiceHandles = $client->Debtor_GetInvoices(array('debtorHandle' => $debtorHandle))->Debtor_GetInvoicesResult->InvoiceHandle;
        $num_Invoices = count($InvoiceHandles);

        if($num_Invoices > 0)
        {
            $Invoice .= "<h2>".$num_Invoices." faktura</h2>";
            if($num_Invoices > 1)
            {    
                $InvoiceDataObjects = $client->Invoice_GetDataArray(array('entityHandles' => $InvoiceHandles))->Invoice_GetDataArrayResult->InvoiceData;
            }
            else
            {    
                $InvoiceDataObjects[] = $client->Invoice_GetData(array('entityHandle' => $InvoiceHandles))->Invoice_GetDataResult;
            }.....

Can i limit this om date og number of invoices?

i need invoicesfor the last 14momth

max 30 invoices