Seconds even. Probably less than 5, maybe half a second. By the time I realized only a breaker blew (the rest of the house was powered) the UPS shut down. I didn't drain the battery, I think I was drawing too much power, must have tripped the UPS' breaker too. LOL!
I got real good at compiling and installing Gentoo (stage1 no doubt.) Ended up building six sets of packages (PentiumII, PentiumIII, PentiumIV for server installs, and the same for workstation installs) and bunches of kernels for the various classes of systems I use. Made tarballs of everything, and am now working on tarballs of configured systems for the various machines I want to upgrade (from RedHat 7.2--cringe.) When they're ready, all I'll need to do to upgrade a machine is to boot the LiveCD, fdisk, mke2fs, untar, grub-install, and reboot ready to go. Very happy.
Soooo, what are you going to do in your spare time?
OUCH.
Sounds like my "three minutes until oblivion" Office UPS.
In reality I have to crash dump things to shut down in under a minute.
The power company here likes to play little voltage games, so we call them "Spike and Bite", because the voltage in the lines spikes and then drops off the scale.
Friend of mine swears by RedHat 7.2...
*scratches head*
LOL!
When you get to doing the upgrades on the project machines, good luck.
And have fun.
*chuckle*
right click 'save target as' Zorak on strike, save image as Zoraksign.