Originally Posted by moondog

You can fly in from HK or depart to HK, but can't use it both in and out.

Originally Posted by travelinmanS

You can, however, enter through HK and depart to Macau then hop on a quick ferry back to HK if you so desired.

Originally Posted by YariGuy

This brings up a question - can't you just keep doing the above (for Guangdong, at least) -- rinse, lather, repeat? Enter Shenzhen from HK, exit to Macau, ferry back to HK?

Are there rules as to how often you can do TWOV, or whether you can re-enter China immediately (or the next day) after you exit?

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.