How many days to hang up the white blood cells 20.39 needs to be decided according to the cause of the disease, the extent of the disease and the treatment. Generally speaking, bacterial infections (e.g. pneumonia) need intravenous medication for at least 7 days, and in the case of hematological disorders (e.g. leukemia), the time required will be longer. The normal range of white blood cells is 4~10×10⁹/L. 20.39 belongs to the elevated level of white blood cells, which is commonly found in bacterial infections (e.g., acute tonsillitis, pneumonia, etc.), and some hematologic diseases (e.g., acute leukemia). In the case of bacterial infections such as acute tonsillitis or pneumonia, intravenous medication is usually required for 7 days with the use of sensitive antimicrobial drugs, or 10-14 days if combined with underlying diseases (e.g., diabetes mellitus) or autoimmune deficiencies. If intravenous chemotherapy is required for elevated white blood cells due to acute leukemia, the medication will be administered in fractions of a course, with each course of intravenous fluids typically lasting 1-2 days. Therefore, the number of days of fluid administration for leukocyte 20.39 depends on the severity of the disease and the treatment plan.