A little more thought makes me wonder if you would want it to be savable. I think
I would vote to expire it after say...2-4 weeks. Definitely wouldn't want people to be able to save too many of them.
If you let people save up say 2 of them it would give them a weekend off once in a while without the potential for a month of free food. A month of free food seems to me like a good way to build up one hella army....



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