留学博士研究生的学习年限最长不超过6年；留学硕士研究生的学习年限最长不超过5年；留学本科生的学习年限最长不超过6年。
学生应在学习期限结束前一个月申请延期，如学习期限在当年7月结束，应在当年6月申请延期。
Extension
The completing time of PhD program shall be 6 years as the maximum. The completing time of master program shall be 5 years as the maximum. The completing time of bachelor program shall be 6 years as the maximum.
Students shall apply for extension one month before the end of the study period. If the study period ends in July of the current year, they should apply for extension in June.
河海大学延期毕业生申请学习期限延长操作手册
User Manuals of Study Period Extension,Hohai University