If biscotti get stale, you can crisp them up really quickly by putting them in a toaster oven for a few minutes on about 350F (or a regular oven). Put them right on the rack. Let them cool (they'll still be a bit soft when still hot) and then eat away. I do keep extras either in the freezer or in an airtight jar.
Biscotti does not keep for a long amount of time, however an air right container and food service film can extend the life of your biscotti by 2-3 days
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If anyone has trouble with this let me know and I will be too happy to help.