Hello
@James *******
, In Bangkok, Samut Prakan, I confirm that immigration requires that you still have at least 3 weeks on your stamp.
In a first step, you will apply for the O visa (90 days), then a second application for the extension of one year.
This imposed period of 3 weeks, corresponds to the possibility of receiving the visit of two immigration police officers to ensure the veracity of the marriage.
This can be perceived in a strange way. You will be photographed by one of them. With a little investigation of the neighborhood.
No worries if you are a real married couple. If you need any help, you should contact visathailand.com They can help about this process