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Can I group numbers -- instead of spelling them out -- for ease of reading?

Do you agree with all my examples?
  • The conversation lasted anywhere from 5 to 15 minutes.
  • It was a 5- to 15-minute conversation.
  • OR: It was a 5 to 15 minute conversation (no hyphens).
Thank you very much.
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My opinion:

  • The conversation lasted anywhere from 5 to 15 minutes. --Fine.
  • It was a 5- to 15-minute conversation. -- Technically correct but may appear fussy, especially in less formal writing.
  • OR: It was a 5 to 15 minute conversation (no hyphens). -- Tolerable.