How is the 800k requirement calculated for retirement extension renewal in Thailand?

To calculate the necessary time that your 800k must be in your account for a retirement extension renewal in Thailand, it is required to be in your account a full 2 calendar months before applying for the extension. This means that if you apply early, you need to ensure the funds were present in your account two months prior to your application date, irrespective of the actual expiration date of your current visa.