If it comes in the can I'm guessing you're ok at room temp for a long time because I know that stuff sits on HBS shelves for a while. If its the kind in the plastic milk jugs I think its more important to get it in the fridge because the seal isn't as good, but I still think it can keep for a week or so out of the fridge (not sure just guessing so if someone has learned the hard way about how long it keeps please chime in.