Goodness I have one company which is organic certified and was told by the auditor that customers HAVE to be contacted.
I would expect traceability and contact to be made with customers to be made within 4 hours but confirmation of receipt takes longer due to time zones ( Canadian and US customers).
We just did one today and have made contact with all European Customers and are waiting for responses from the North Americans/Canadians.
It's amazing how many of the customers have no clue what we are doing! I would have thought Recall tests are de rigeur these days.