现在F1学生签证的有效期延长至5年，是否意味着我最多可以在美国停留5年，即使我的学习项目已经结束？

当然不是！F1学生签证的有效期并不是由签证的失效日期决定，是以在美期间所持学生身份的状态所决定的。这包括你所有科目的学习时间、获准的课外实习的所需时间，加上学习项目或实习结束后的60天，而你必须在这60天内离开美国。如果你的学生身份在学生和交流访问学者信息（SEVIS）系统里显示失效，那你的学生签证也就无效了。

Now that F1 validity has extended to 5 years, can I stay in the US up to five years even after completion of my program? NO! Your F1 visa validity is not determined by your visa expiration date. It is determined by your duration of status as a student, which includes the full course of study and any additional periods of authorized practical training, plus 60 days following the completion of the study or practical training within which to depart the US. If you are not active in the SEVIS system, then your student visa is invalid.

来源：2017-03-24美国驻华大使馆美国驻华大使馆