How long do you need to keep 800K THB in a Thai bank account after receiving a retirement extension before you can lower it to 400K?

After receiving a retirement extension of stay in Thailand, the balance in your Thai bank account must remain at 800,000 THB for 3 months. After this period, you can lower the balance to 400,000 THB, but you must ensure to top it back up to 800,000 THB at least 2 months before applying for your extension the following year.