Well, this is probably too late. If you left it in the mash, it may have developed a slightly sour quality -- not unlike sour mash. That could wind up being tasty. If you put it in your boil pot and waited to start your boil, you are fine. You'll get some bacteria, but the boil will kill them off.
Brody's Brew House
Primary: Spiced ale
Planned: Butternut squash & gala apple harvest ale; brown ale or porter; barley wine
In the fridge: Dogfish 60 minute; Imperial Stout