How long are cooked oysters good?

As long as your willing to eat them. This is a tough question to answer. If the oysters were on the verge of spoiling prior to cooking then that changes everything. It also depends on how they were cooked. Fried oysters will be fine refrigerated for a few days where as oyster stew will be good for just about a week. Seriously I wouldn't eat cooked oysters more than 3 or 4 days old.