Come every six months, apply for the return permit, and that other thing N-419?) (Not most useful, but doesn;t hurt to apply. ) Makes sure you must come back within 2.5 years, or your time before will be losing one by one.
Make sure your compamy put your assignment in writing as well.
Good luck and enjoy Wai Pai...
One more thing, you actually can apply for citizenship 3 months before the 5 year deadline.
