The easiest answer as to timing for an antenuptual agreement is as far in advance as possible. There are some recent cases that have come out about cases involving antenuptual agreements that were signed the night before the wedding party was to leave for the Bahamas for their wedding. That was determined to be a sense of duress for a party because by then they had no real option other than to sign the document. If planning had gone into the process and the document had been completed long in advance, those types of problems would not exist.