I saw the advices from TV is you can get the non-imm O from savanakhet and you need to leave Thailand every 90days but you can also choose to apply for a 60 days extension of stay based on marriage paying 1,900baht.

Where can I apply for this 60days extension of stay?

Can it be done in Phitsanulok immigration? (I assume not all immigration will do the process )

If my first 60 days extension of stay was done in Phitsanulok immigration,

Can my next 60 days extension of stay application do it in Bangkok immigration?

You can apply for the 60 day extension to visit your wife at any immigration office if you have proof of residence for the area the office is responsible for.

Be sure to bring your wife with you for the application, as she will have to confirm that the two of you are living together.

only one 60 day extension per entry to Thailand. so after an extension a border crossing run will be required.

getting a fresh 90 day entry just prior to the expiry date of the actual visa, coupled with a 60 day entension will make the one year visa last almost 17 months

Be sure to bring your wife with you for the application, as she will have to confirm that the two of you are living together.

only one 60 day extension per entry to Thailand. so after an extension a border crossing run will be required.

getting a fresh 90 day entry just prior to the expiry date of the actual visa, coupled with a 60 day entension will make the one year visa last almost 17 months

Ok. Thanks! [emoji7]