All - my previous answers to cuh questions have all revolved around decomposing sets of Contacts (or whatever object are in question) into distinct subsets that can be incrementally delayed. Example - all contats with first name beginning with ‘A’ get delay of 1 min, ‘B’, 2 min, etc. Within the workdlows, API calls will each have backoff approaches for the 429 errors, but the delay cannot be more than 20s cumulatively, otherwise the custom code step will fail for other limits.
I’ve never found any way to ‘cheat’ around this rather fundamantal system limit.
Steve