Over/Under for how many fresh oysters can be ate in 2 hours?

Hi - due to a wager placed 4 years ago - a friend of mine will finally be attempting to eat 250 fresh-shucked oysters in 2 hours. I party is being held to honour this event - and I have been designated to ign a over/under line - so party participants can wager on how far the eater will get. I'd prefer any factual information over opinions, Thanks,