Minimum time to be planned for transit in Chongqing Airprt.

Hello,
We have an international flight with Finnair from Helsinki to CQ. We would like to book a ticket with AirAsia to leave directly without leaving the airport.
How much time should we plan between our two flights?
We understand we won't need to have a VISA but how much time should we plan to go through the customs?
Thank you in advance for your answer.
Mylène