It's pretty much common knoledge that ketone that is not pure, decomposes if left at room temp, giving shit yields.
If you ever have to hold off on the final distilliations the rxn should be stuck in the fridge. Personally, for what ketone is worth per gram, I wouldn't do the rxn if I didn't have the time to see it all the way through to pure ketone. Too much regret otherwise. Yields are never as good.