I have a corny keg that I used co2 with. I chilled it, and we didn't drink it all, and it has gone back to room temp. Is it still good, and if so, for how long?
Depends somewhat on the style and what you call room temperature, but at least 2-3 months. I've got a 5 year old barleywine in the conditioning cabinet.
PS You'll get more responses if your title tells people a bit about the problem.