May I get some more information about the shelf-life of this extraction?

A friend of mine had a medical emergency and will not be able to smoke anymore. I have decided that I will help her out by making her a constant supply of 'edibles' and thought that I would go ahead and use the method described in this thread.

The problem is, I was originally planning on making half of a year's worth of capsules for her; it is a good thing I didn't because it would completely suck to lose that much work do to some sort of degradation.

So again I ask, what is the deal with the last two posters results? Does anyone have any hard numbers on how long this stuff will last and in what conditions?

Please help! Not for me, but for my friend.