What is the process for applying for a 12-month extension of the Thai Wife Visa?

Report from CW for application of 12month extension of "Thai Wife" Visa: Arrived 8.45am, received queue #58. Officers were processing at rate of about 10 applications per hour. So my queue came up 2pm. I submitted the same set of documents as for my original application to apply for the "O" visa plus 3 additional forms (you can can get these from the counter) and the TM7. Officer checked through my documents 5 times (!), all good. We have 1 child, they also requested birth certificate (fortunately I had a copy with me). Also ensure you have original of marriage certificate. Received my passport back at 2.45pm with the "Under Consideration" stamp to return 3 May (which I realised later is a public holiday?). There was also a paper stapled stating I need to make my 90 days report by 28 June.