You can definitely make them in advance . . . even WEEKS in advance. I do not recommend storing them in the refrigerator at all as this can not only make them brittle when you try to handle them, but it can also affect the sheen of your chocolate. I have made some in advance and I just store them in an airtight container (tupperware) with waxed paper between layers and keep them somewhere that they aren't exposed to too much light or heat. I 've kept them in the corner of my kitchen counter for a few days or even put them in my pantry or on my dining room table. They won't melt unless you expose them to heat.
I definitely recommend making a few extra, though, and make sure they're thick enough because you most likely will have some breakage when you're trying to apply them to your cake. The times I make extra, I never need them but the one time I DIDN'T have any extra, of course, one broke and I was trying to make it look good and hide the cracks.
Let me know if you have any other questions . . . this is one of my favorite techniques!
carol
room temp. unless it's extremely warm 80 degrees plus! I would just stick it in a ziploc baggy and then in a tupperware container so it doesn't get broken....up and outta the way......I don't see why it wouldn't last just as long as the chocolate would last at room temp as long as it's kept fresh.
It should last a long time unless they get dusty or something. Just think of it like a chocolate bar. They last a long long time! I agree, they do break fairly easily, you might want to make extra if you are going to store them for a long time. I usually just make one now and keep them on a cookie sheet for short term. They are easier to handle on a sucker stick. so if you want them sticking up off of the cake, it is a great way to keep from handling them. I have some in my photos if you dont understand what i mean.
It should last a long time unless they get dusty or something. Just think of it like a chocolate bar. .
That's how my husband describes them to people. 
I've made them well ahead and just stored them, it makes the day of decorating easier since all you have to do is throw them on.
I mixed a few white candy melts with a little bit of orange and pink candy melts. It looked pretty good (my fireman in photos)
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