Ideally, a couple should have a conversation about a prenuptial agreement as far in advance of the wedding as possible. The closer the wedding date, the more pressure a person may feel to sign an agreement. A person could say that he or she signed under duress, which, if proven, could invalidate the document. The goal is to have plenty of time to calmly talk through these issues, negotiate the agreement, disclose assets and liabilities, and allow both parties the opportunity to have legal representation well in advance of the nuptials.