What is the process and considerations for moving ฿800k associated with a retirement visa from one bank to another to chase a higher interest rate.

Is same day generally ok?

Do I need both updated bank books and both bank letters for the next visa renewal?

I’m in Chiangmai.

Edit: Interest bearing fixed deposit accounts are available in Thailand and are perfectly acceptable to immigration authorities for visa purposes. I’m well aware of the balance requirements.

I’m certain people change banks. Specifically I’m looking for the procedure.