@Paul ******
Bangkok bank takes up to 4 working days to process the 12 month statement, It is issued at the main branch, and its carrier literally has to deliver it to the branch you visit. Other major banks issue it in 5 minutes.
You can split your statement in half, like requesting the first 6 months now, introduce your spouse or friend to the bank staff that he/ she will collect it for you and request the other 6 months that you ca get it right away when you return.