The correct spelling for "lifes durations" is "life's duration" (IPA: laɪfs djuːˈreɪʃən), indicating the duration or span of an individual's life. The apostrophe before the "s" signifies that the duration belongs to, or is possessed by, life. It's important to pay attention to apostrophes in English, as they can greatly affect the meaning of a sentence. Ensuring proper spelling and punctuation can enhance communication and prevent misunderstandings.