I haven't got any direct experience with XTOL yet, but a lot of folks recommend using distilled water to mix the stock, and the shelf life is 6+ months in a full container, 2 months or so in a partially full one. With that in mind I've bought a bunch of 500ml amber Boston Rounds for storing stock, so in my 3 reel Patterson tank 1 bottle will do one processing run at 1+1, or two runs at 1+3.
If you want to keep using HC-110, you could just pour out the concentrate into 4 smaller bottles to keep it fresh longer. I'm using up my last bottle of HC-110 that "expired" January 2012, and it's still fine, and all I did was add marbles to the bottle to keep air to a minimum.
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