Is a temporary Zihar (equivocation regarding marital relations) valid?

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A temporary Zihar is valid, such as when a man says to his wife, 'You are to me like the back of my mother for a month,' or 'until the month of Ramadan concludes.' When the stipulated time passes, the Zihar is lifted, and the wife becomes permissible without expiation (kaffarah). This is the position of Ibn Abbas, Atah, Qatadah, Al-Thawri, Ishaq, Abu Thawr, and one opinion of Al-Shafi'i. The evidence for this is the Hadith of Salama ibn Sakhr, who said he pronounced Zihar against his wife until Ramadan ended, and the Prophet (peace be upon him) ordered him to perform expiation only after he had relations with her during that month, not merely upon uttering the statement. Furthermore, Zihar is a prohibition established by an oath that requires expiation if broken, thus it can be time-bound, similar to Ila' (oath of abstinence), distinguishing it from divorce which dissolves ownership.