You can’t generalize about how many days it takes to get over a 39 degree fever from a bacterial infection. It usually returns to normal in about 3 to 7 days, but if the condition is serious, it may take longer to recover. If the fever is only caused by a simple bacterial infection with a temperature of 39 degrees, but there are no other pathogenic bacteria present and the condition is not serious, the duration of the illness can be shortened to about 3 to 7 days with prompt treatment. If the degree of bacterial infection is more serious and combined with other pathogenic bacteria, the temperature is continuously rising, the duration of the disease is relatively longer, it may reach about 7 to 10 days, or even longer, but the details should be analyzed in conjunction with the effectiveness of the treatment as well as the individual’s physical condition. Bacterial infections causing high fever that does not go away are recommended to seek prompt medical attention and to choose the most appropriate antibiotics through the results of bacterial cultures and drug sensitivity tests. The use of antibacterial drugs must follow the doctor’s instructions, not blindly use their own drugs, so as not to cause adverse consequences.