What is the ruling on granting usufruct (A'riyah) concerning its duration?

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The granting of usufruct (A'riyah) is permissible whether designated for a specific time (mu'aqqatah) or unrestricted (mutlaqah), because it constitutes a license, akin to licensing the use of food. The lender retains the right to revoke the loan at any time they wish, regardless of whether the term was specified or unrestricted, unless the borrower has occupied the object with something that would cause detriment upon repossession. This view is held by Abu Hanifa and Al-Shafi'i. The evidence for the revocability at will is that future usufruct has not yet materialized in the borrower's possession, so it cannot be fully granted through the loan, similar to when the physical object itself is not yet in his possession. The case of a slave bequeathed for service is distinguished because the bequest originates from someone other than the heirs, and the bequestor retains the right of revocation, unlike the current case where the lender grants the benefit.