AIDS usually develops in about 6-8 years, and may reach more than a decade in the long run, or between 1-2 years in the short run. The duration of the onset of the disease is related to the number of HIV infections and the immune status of the individual. The first stage is the acute infection period, which is usually around 3-4 weeks after the infection. The second stage is the asymptomatic stage, during which patients do not experience any discomfort. Some patients will enter the third stage called the AIDS stage, which is characterized by low fever, diarrhea, and various opportunistic infections and tumors.