Don't have any Fixed Price listings or Auctions with Buy It Now while you are gone. Having a paying buyer and not being able to ship in a timely manner is sure to lead to unhappy customers who show it in their feedback and DSRs.
I would suggest having only Auctions listed (no BIN) that will end after you return home. And only then if you will have internet access so that you can answer buyer questions in a timely manner.
Then there is no need to tell any potential buyers that you will be away. Better off that way if anyone knows your address.
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