The sentence is not constructed correctly and in its present form is not understandable. It should be, for example: The only time I've slept anywhere other than at home is when I was on vacation abroad.
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AnonymousThis is the only time I've ever slept anywhere other than at home other than when I'm on vacation abroad.I don't believe "Anonymous #2" understood what "Anonymous #1" was trying to say. (This is one reason why it's so much easier when people register!)