WCF error time - Await Jquery Post

Question

I have this method, which until then works well:

$('#modelEditar').submit(function (e) {


$.post($(this).attr('EnvioLote'), $(this).serialize(), function (json) {
        if (json.sucesso == false) {
            $("#mensagemalerta").html(json.resultado);
            $("#alerta").show();
            $("#alerta").fadeTo(3000, 500).slideUp(500, function () {
                $("#alerta").slideUp(500);
            });
        }
        else {
            alert('Lote Enviado com Sucesso.');
            window.location.href = "/NFSe/EnvioLote/";
        }
    }, 'json');

    return false;
});

What happens is that when it takes too long, because it is signing a large file, it returns an error 500. I would like him to wait for the return after sending to the webservice, because first sign, and send, and if successful or not, it returns. To then show the result.

He goes to this signing line:

 var assinar = await client.AssinarXmlRAsync(empresa.Caminho + "\\NFSe-LOTE" + model.IdLote.ToString().PadLeft(15, '0') + ".xml", "Rps", "InfDeclaracaoPrestacaoServico", empresa.Serial, Numero.ToString(), empresa.Pin);

And as the return delay, it shows the error. I need it to wait for the return.

EDIT How I’m using WCF now he’s returning the following error, which was what I imagined, the time:

Timeoutexception: The request Channel timed out attempting to send after 00:01:00. Increase the timeout value passed to the call to Request or Increase the Sendtimeout value on the Binding. The time allotted to this Operation may have been a Portion of a longer timeout.

The error is this line even though I reported, to sign.