A:
Most UPS are designed to protect and keep your electronic components - TVs, PCs, routers, servers, etc., up and running for a short period of time while you can safely shutdown and/or unplug the component.
The length of time that they will keep a component up is based on several factors. One would be how much load is on the UPS, and if the battery is fully charged or not.
You should call tech support, give them the specs of your device(s) and they can tell you how long the UPS will be able to keep the device(s) up until your generator or the power kicks in.