An individual receives a massive transfusion in an emergency…

An individual receives a massive transfusion in an emergency situation.  It is later determined that the patient is blood group B Positive but that was not known at the time of transfusion so they were transfused with group O RBCs and group AB plasma.  When may the patient be safely transfused with group B red cells?  (Note: a massive transfusion is defined as infusion, within a 24 hour period, of a volume of blood approximately equal to the recipient’s total blood volume)