Reading answers from  [this question][1] from Google Meet Help, as long as you regularly used the link, then the link continues to remain valid. **However, it expires after 90 days if not used** but there is always the possibility that 
Google will change its policy so maybe make an entry in your diary beforehand to make sure it persists.


  [1]: https://support.google.com/meet/thread/32930317?hl=en