When renewing a marriage visa in Thailand, how long must the 400,000 baht be in my bank account?

when applying for a yearly extension of stay based on marriage to a thai using banked money the 400K baht needs to be in a thai bank account in your name only for 2 months prior to you applying for the extension.

AND

keep in mind some immigration offices will tell you to keep the money in the account for the 30 day under consideration period too until you come back to get your year extension inked in. SO listen for what they tell you to do when you come back.