f9503869__PRC_designated_economic_areas__Use_and_final_destinations
[0] (vii) [Duty and VAT obligations] Bonded goods can stay in FTZ and EPZ without time limit. [Use and final destinations] 
Bonded goods stay within the PRC for a period exceeding 1 year.
HKTDC Forum: Customs & Tariffs - Duty and VAT rules in PRC designated economic areas
Use and final destinations