@Tony ***********

on each entry of the multiple entry O visa, you get 90 days to stay inside Thailand. You can leave before 90 days are up too, and the next time you stamp in (within the visa validity, of course), you get a new period of 90 days (the day you enter is Day 1 of 90, btw).

@Bell ******

For year-long extension after the single-entry O visa, you either need to show a seasoned lump sum of ฿800k in a Thai bank, or 12 regular monthly transfers into a Thai bank of ฿65k or more each. Thai bank account needs to be in the applicant‘s name only, or if joint, the amounts will be halved. UK embassy no longer issues affidavit of income letters, so not applicable to your OH.

But strongly advised to have on each entry the 3 proofs-of: ฿20k equivalent in Cash, Accommodation, onward journey. The Immigration Officer will still have the discretion to deny entry on back-to-back visa exemption history like this.

If it's a single re-entry permit, why not just border run to expire the old permit to stay and stamp in on the Non-B?

You can try to get the extension in Chiangmai first since you are already there. Immigration is next to the airport.

Do note that on your return you only retain the original permitted to stay from your initial entry. Following from your example in the original post, if you leave after 20 days with a re-entry permit, upon your return, you do not get 40 days more. The period that you are away will continue to run down the 40 days. But you can then go get the extension from Immigration.

Anyway, the way METV works is that you can enter Thailand multiple times within the 6 months it is valid (starts the day it goes in your passport). On each entry, you get a 60 day stay, which you can extend at Immigration for ฿1,900 to get another 30 days. If a border bounce is easier, forego the extension.

And yours was a Single-type, so it’s used up.

That will match the expiry date of your original extension of stay done at Immigration. That’s the purpose of a re-entry permit - allow you to exit and return with the same permitted to stay you had before leaving.

And if you’re thinking retirement extension, it’s ฿65k or more per month, not 60k.