Originally Posted by travelinmanS

I think they don’t let you walk across the border into China using TWOV, you need to fly into an airport which in your scenario would mean taking a HKG-CAN flight over and over again.

I’m not sure if there is a limit on TWOV or a duration between trips that must be adhered to in order to enter. From the rules it seems like there is no such limit, but who knows the reality on the ground. Maybe someone on here can test it out for us and report back after 3 or 4 TWOV trips in quick succession.