The duration of power supply that a UPS (Uninterruptible Power Supply) can provide varies depending on the UPS's capacity and the power consumption of the connected devices.

A UPS is powered by an internal battery that charges when power is available. During a power outage, the UPS automatically switches to battery power to ensure that the connected devices remain operational.

The duration of the power supply is determined by the UPS's capacity, expressed in Voltampere (VA) or Watt (W), and the power consumption of the connected devices. Generally, the higher the UPS's capacity and the lower the devices' power consumption, the longer the UPS can supply power.

The specifications of a UPS usually indicate the maximum duration for which the device can provide power at a certain load. For example, a UPS with a capacity of 1000 VA may be able to provide power for a shorter time at full load of 1000 Watts than at a lower load.

It is important to understand that a UPS is not meant to bridge long-term power outages but rather to provide a temporary power source to safely shut down devices or bridge short-term power interruptions.

If you want specific information about the power supply duration of a particular UPS, it is advisable to consult the technical specifications and manual of the respective model.