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Phrase(s): Come back when you can stay longer.
Come back again sometime when your visit can be longer. (Often said by a host or hostess to departing guests.) • John: I really must go. Sue: So glad you could come. Please come back when you can stay longer. • Bill: Well, I hate to eat and run, but I have to get up early tomorrow. Mary: Well, come back when you can stay longer.
McGrawhill's American Idioms And Phrasal Verbs