What is the ruling if a gift of ownership is time-limited to a period other than the lifespan of the recipient (i.e., not 'Umra or Ruqba)?

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If a gift of ownership is time-limited (e.g., for one year, until the Hajj arrives, or until a son matures), it is invalid. This is because a gift of ownership is not permitted to be time-limited, similar to a sale, as ownership is perpetual. This differs from 'Umra because limiting it to the recipient's life is intrinsically limiting it to a definite period, making it effectively absolute.