I'm still running some 3.11 workstations off an NT server. It's been running, but for occasional power interruptions, since 1994. Never a forced reboot. Never had to reload anything except the fix for Y2K. If I ever have to replace any of the 500 meg drives, that could be a problem though.
I still have a machine that runs on 3.11 WFW for a particular day-to-day critical custom application. Solid as a rock.
LOL! You should contact MS about this. Maybe they'll do an ad spread on you similar to the Volvo and VW ads that show their cars going a million miles.
Either that or they'd berate you for not upgrading ;-)