Comment by cpard

yes, what you describe feels like a one off job that you want to run, which is big and also not time critical.

Here's an example:

If you are a TV broadcaster and you want to summarize and annotate the content generated in the past 12 hours you most probably need to have access to the summaries of the previous 12 hours too.

Now if you submit a batch job for the first 12 hours of content, you might end up in a situation where you want to process the next batch but the previous one is not delivered yet.

And imo that's fine as long as you somehow know that it will take more than 12h to complete but it might be delivered to you in 1h or in 23h.

That's the part of the these batch APIs that I find hard to understand how you use in a production environment outside of one off jobs.