Originally Posted by
2stepsbehind
With rewards tickets can't this be gamed i.e. you book a 9am return flight to be within the 72 window, but then change the flight to leave at 1pm so you overstay by 4ish hours? Experience? Horror stories?
I guess anyone with half a brain left will STRONGLY tell you to not try such tricks, unless you absolutely insist on the very good probability to have big trouble in ever returning back to China afterwards.
Basically, what you try to smells very much like trouble. Unless you try it in CAN, where you'll be perfectly within limits (as TWOV there is arrival day+72 hours)