I'm a CH lover, especially in a cob. I read in another thread about Hearth & Home, Chatham Manor as a good substitute for CH. I'd like to try it. But...I don't light up my pipe everyday. And now that winter is here in upstate NY, I don't go out as much to smoke. My questions is. Because I can only purchase the 14 oz tin size, how long in the tin before that tobacco turns to some kind of crusty, mold, or so dry that it's unsmokable?