How many days in advance can you obtain a financial letter from the bank for a NON-O visa renewal at Changwattana?

For a NON-O visa renewal at the Changwattana Immigration Office, bank letters are accepted if they are up to 7 days old. Additionally, it's important to have the bank book updated on the same day as the application. A 1-year bank statement is also valid if it is issued within 7 days.