Final answer:
Blood transfusions should ideally be started within 30 minutes to 1 hour after obtaining it from the blood bank to minimize the risk of bacterial growth.
Step-by-step explanation:
When blood is obtained from the blood bank, it should ideally be started within 30 minutes to 1 hour. The reason for this is to minimize the risk of bacterial growth in the blood and to ensure that the blood is still in a viable state for transfusion.