Ngrok Live Link - Limitations?

Wondering if anyone from Flywheel can confirm what the limitations are on providing a live link to a site in Local?

I’ve seen mention of a limit of 20 connections, but is there also a time limit? Or any other limitations?

Am aware that the PC/Local should not be turned off, but that does not appear to be the cause of a client’s recent loss of connection to the live link.