Walking distance from domestic terminal to Metro Line 3 in guangzhou airport

Hi there, my flight from Xi'an to GZ will arrive at 10.25pm. I do not have any check in luggage to pick up. Since it is a domestic flight arrival, don't think I there are immigration check points.

Assuming my flight is on time, how long does it take to walk from domestic terminal to the metro line 3 (average walking speed...no rushing)? I hope I can catch the last train at 11pm to Guangzhou East Railway Station. This should give me an estimated time so I can either decide to walk to Metro or just queue for a taxi.