If it saves time, then somebody is supposed to spend that time.
When the process is new, then in order to determine the amount of saved hours, you have to see how much time this new process would take to be manually completed by a person. This would be the saved time.
I have no doubts that you are aware that this is an estimated time and it can be quite subjective sometimes.
I’m afraid that something better that the Process Assessment Tool we don’t have at this moment…
Best regards,
Marius