Required length of time for transit smoothly at Guangzhou Airport

I have a choice of either 7 hour transit or about 2 hour transit at Baiyun Airport, from an international flight to another international flight. I am wondering if 2 hours is sufficient time with the queues and security check, etc at the Baiyun airport. I do not wish to leave the airport to visit the city. Is 2 hours plenty of time or it is risky and may miss my connecting flight to Auckland?