We applied in BKK. Every since, almost 13 yrs now, we lived in Thailand just under the 180 day limit. One time returning to the US, the officer counted the days, smile, and said I see you have done your homework. It is faster to apply in BKK. As someone had said, it took about 3 months, My wife got a 10 year, but passed citizen test in 3.
I see---Another old post