Section 250 - Agreements relating to marriage; statute of limitations1. The statute of limitations for commencing an action or proceeding or for claiming a defense that arises from an agreement made pursuant to subdivision three of part B of section two hundred thirty-six of this article entered into (a) prior to a marriage or (b) during the marriage, but prior to the service of process in a matrimonial action or proceeding, shall be three years.2. The statute of limitations shall be tolled until (a) process has been served in such matrimonial action or proceeding, or (b) the death of one of the parties.3. The provisions of this section shall not apply to a separation agreement or an agreement made during the pendency of a matrimonial action or in settlement thereof.