@Stelar ******
one year. Best to bring your wife. Without your wife you may only get 90 days. On the paper they don’t mentions the one year multi entry so select Non-O and hand write one year and write 5000 baht so no confusion what you want in the form.
1. Copy of wife house book
2. Copy of wife ID front and back
3. Copy of your BIO passport
4. Physically want to see rose marriage certificate
5. Copy of marriage rose certificate
6. Print out form from website at Thai embassy in Savannakhet requesting Non-O,
Arrive early at least an hour before they open so 8am. 11am they stop so be early. Can collect your passport the next day. I went on a Friday so no line but had to wait until Monday to get my passport back.
I just did this in October with one year multi entry stamp.
One man reported they only gave him 90 days because they felt he had no money. So print out any Proof you have income coming in just in case. Another man said he didn’t bring his wife only a letter from her and they gave him only 90 days.