Usually the last 30 days of your current stay. But could be the last 45 days. Samui immigration will have that piece of info.

Check online - search there are services listed.

A Non Imm O multi entry Visa for marriage is extended by three months if one does a border crossing and returns Before the Expiry Date of that one year. Very commonly done

Not true for a Non Imm O...

But true for a Non Imm O-A Visa... Note the A

This thread is closed pending a new post with new ideas. And taking the TransferWise issue to another Discussion Group

Ron your input is helpful but a bit myopic. You seem to think that the problem can only be solved one way. Take note of my new post coming up.

This thread is now closed so we can focus on new ideas in my forthcoming post.

I will be posting later to those interested in pursuing this problem outside of Thai Visa Advice and outside of Thai visa dot com.

It is obvious that this TransferWise support person believes that the question is centered around an Investment Visa via a Condo. Interesting but has little to do with the overall need and question. But this answer from TW is all we are likely to get.

It is revealing that the banks involved have been reduced from 3 to 2... Kasikorn and Bangkok Bank. That is helpful.

To get the other year - you need to Exit and Reenter Thailand a few days before the first year Expiry. You can't just exit and come back after the first year Expiry date. So you need to do a border bounce Before you head home

David Karnovski - Tod and others have explained it