Having finally cracked the power/wireless issue yesterday, I have set my t'internet facing raspi up to see how long it will go.
As well as running a tiny website on a lighttpd install Its got a 10 second ping to 8.8.8.8 (Google running) thats it - uptime is 20 hours - no hiccups, no WLAN down no anything.
And my plan is it will stay like that until it either dies or needs to be moved

So who's gone the furthest so far?