Question : Problem: How long does a fully charged APC UPS usually last while running on battery power?

How long does a fully charged APC UPS usually last while running on battery power?
I understand this is relative to how much power is being drawn from the UPS.
I have a Linksys Wireless G Access point, a cable modem, a Linksys VPN router, and a Dell Optiplex desktop plugged into a brand new APC UPS ES 350/550.  How long will the UPS power this equipment during a power outage?  Any ideas?

Thanks.

Answer : Problem: How long does a fully charged APC UPS usually last while running on battery power?

Looks like between 2 - 10 minutes depending on load.

http://www.apcc.com/products/runtime_for_extendedruntime.cfm?upsfamily=21