我想请问一下大家我的一个情况是不是算gap了，谢谢！
2018年10月2日离境，2018年10月7日签证到期
2019年3月20号申请新的学生签，21号拿到，23号入境
中间在国内呆了172天左右
想请问一下这个情况没有在28天内重新申请新的签证是不是就算gap了啊?
还是说28天只是要求签证逾期了的情况。
离境的话，只要是在有效签证离境和入境，180天内是没有问题的？
这是我在long residence上看到的example，和我的很像
Example 2
An applicant:
• enters the UK on 1 September 2004 with entry clearance as a student which is valid until 31 October 2005
• leaves the UK on 25 October 2005, before their previous leave expired
• re-enters the UK with valid entry clearance as a student on 5 January 2006
The person had valid leave on the date of their departure and on the date of their return to the UK, and the time spent outside the UK was less than 6 months. Continuous residence has been maintained, even though the person entered the UK with a fresh grant of leave.
非常感谢大家的解答！