Maybe you can try a miner, let it find one share then stop it. I can guarantee its not valid not much more than 24 hours!!!
Or if thats too difficult see with your eyes -
http://p2pool.servebeer.com:9332/static/sharetime.jpg the last share in graps wasnt valid for a single block....
That's why I left p2pool. I was squeezed out. The one share I got rolled off within 36 hours before a block was found (it was one of those long streaks).
