My friend China Construction Bank Mobile Banking sent me the wrong remittance card number, missing three digits. How long can I return the money to his card? It's been eight days.

Usually it will be automatically returned to his card within three working days. I suggest you check the details with him. If the money has been returned to his card, it will be directly transferred to you through the "expedited interbank transfer" in the "interbank transfer", usually within three hours. I hope it helps you! O(∩_∩)O~