@dan8, I think you can do this by scheduling api workflow recursively.
So you will define an api workflow that will contain an action to perform on a chunk (120) and schedules itself to be called after say 2 mins. The api workflow will be given the full list at the start and once a chuck is processed that chuck is removed from the new list for the rescheduling.
So you will have a condition on the api workflow that checks if the list is not empty.
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