3 to 5 years. According to a query on NetEase News, the upper limit of the economic life of a PDA handheld terminal is 5 years. Under normal circumstances, it cannot be used after 3 years. This depends on a variety of factors, including the maintenance status of the equipment, operating methods, environmental conditions, etc. In order to maximize the service life of the PDA handheld terminal, follow correct operating specifications and avoid excessive or inappropriate operations, and it can be used for up to 5 years.