Three months. The final review is the last and most critical stage in the review cycle. In the final review stage, experts will conduct in-depth review and evaluation of the paper to determine whether the paper meets the requirements and standards of the journal. If the paper passes the final review, it will be accepted and published in the journal. The final review will take longer than the previous stage, because experts need to make a comprehensive evaluation and research on the paper. If the final review time is too long, there will be other reasons, such as journal editors need more time to process manuscripts, or experts need to conduct more in-depth research and analysis of papers. If the paper is rejected in the final stage, the author will receive a rejection letter from the journal editor, stating that the paper does not meet the requirements or standards of the journal. In this case, the author needs to consider re-submitting or selecting other journals to contribute.