What affects the actual number of back-up minutes I can expect from a UPS product?
A range of minutes for expected back-up power are applied to each UPS. The actual number of minutes you’ll get depends on how many items are connected to the UPS and how much “draw” they’re requiring from the UPS. For example, a computer with a Pentium II processor would require a smaller amount of power from the UPS and would get more back-up power minutes than a computer with a faster Pentium IV processor.