To answer the core question: "How long does a 600-watt UPS last?" There is no single magic number. It ranges from 5 to 15 minutes for a standard desktop computer setup, but can easily stretch to over half an hour if you are only running lightweight network gear like a Wi-Fi router. The smartest move you can make before buying a UPS is to calculate the total wattage of the devices you want to protect. That way, you invest in the right capacity and never have to worry about losing your hard work. Have you secured your digital workspace today?