Drafting and finalizing a prenuptial agreement takes time. You want to make sure that you have everything that you feel is important included in this agreement, but also make sure that it is fair. Once everything is complete, the prenup may be forgotten about until the couple decides to file for divorce. People may be under the impression that prenuptial agreements are valid as long as documents are signed. It is true that both parties need to sign a prenup in order for it to be valid, but there are other things that must be done to ensure its validity.