How long must the 400,000 baht remain in my account after getting a one-year extension based on marriage in Thailand?

Once you receive a one-year extension based on marriage, there is no specific duration for which the 400,000 baht must stay in your account, as long as you maintain the required balance two months before applying for the next extension. Typically, you should have the funds in your account during the application process and for the 30-day under consideration period before the extension is approved. It is advisable not to withdraw any amount from the balance until after your extension stamp is in your passport.