Is it permissible for a man to marry a girl for a specified period—such as two or three months or a year—with the payment of the dower (mahr) and deferred dower (mu'akhkhar al-sadaq), and is this marriage considered valid like any other marriage?

Mut'ah marriage (temporary marriage) is forbidden and invalid. The scenario described presents two possibilities: The first is that the agreement at the time of the contract is for a temporary duration. This is impermissible and is a form of Mut'ah marriage. The second is that the husband intends, within himself, for the marriage to be temporary (marriage with the intention of divorce). There is a difference of opinion among jurists regarding this, with the majority deeming it permissible. However, it is more cautious for a Muslim to avoid it and opt for a marriage with the intention of permanence.