How long before visiting immigration can I collect my bank letter of "account in good standing"?

To safely collect your letter of "account in good standing" from your bank before visiting immigration, it is generally advised to obtain the letter no more than 7 days prior to your application. Many commenters noted that some banks, like Bangkok Bank, can issue the letter on the same day, while others may be valid for 3 working days or less. It is recommended to confirm with your specific bank and immigration office as policies may vary by region and bank.