Do you see the bulk job when you log into Salesforce? I have had jobs that seem to "stall" in Salesforce when doing large updates.
During data migrations or mergers we using bulk actions to update millions of rows, but typically those updates are broken down into jobs smaller than 60k. The type of update you are doing (object, number of fields being updated, salesforce actions that are triggered based on the updates) and your api/bulk limits in Salesforce help us define the size of each bulk request. I would say our sweet spot for size of bulk operations is typically 10k-20k, and when doing millions of rows of updates all of our requests are asynchronous and we don't wait for responses (we use other methods for determining which records were not updated successfully). For smaller bulk jobs we do the synchronous calls in Workato to process the failed rows.
