ExecuteMultipleRequest timing out after 1:59:59.

Can someone please explain how to avoid an HttpException (read timeout at 1:59:59) while waiting for an ExecuteMultiple request to process? This seems really counter intuitive to have a Batch function be constrained by a timeout.

I'm executing this code using the SDK from a C# Console Application.

// process invoice updates.
foreach (var list in SplitRequests<UpdateRequest>(invoiceUpdates))
{
ExecuteMultipleRequest request = new ExecuteMultipleRequest() { Settings = executionSettings };
request.Requests = new OrganizationRequestCollection();
request.Requests.AddRange(list);
ExecuteMultipleResponse response = (ExecuteMultipleResponse)service.Execute(request);
}