For Pendo, "Update or Create" syncs will take longer than "Update Only" syncs. This is because - for newly created accounts and visitors - Pendo processes the previous hour’s data at the top of the hour. In addition, it may take up to 15 minutes for the data to fully appear in the UI.
Census will wait until ~15 minutes after the top of the hour to then update the newly created visitor or account with additional properties that are part of the sync.