Legal basis: Article 76 of the Civil Procedure Law of People's Republic of China (PRC), the parties may apply to the people's court for an appraisal on the specialized issue of finding out the facts. Article 78 If the parties have objections to the expert opinion or the people's court considers it necessary for the expert to appear in court, the expert shall testify in court. If the appraiser refuses to testify in court after being notified by the people's court, the appraisal opinion shall not be used as the basis for ascertaining the facts. The party who paid the appraisal fee may request the return of the appraisal fee. Therefore, the time limit for handwriting identification is generally one month. However, for some complicated cases, it will take longer.