How far into the 90 days of my Non Immigrant O visa should I apply for the year extension for marriage to a Thai?
The ฿400,000. Is already seasoned in my Bangkok bank account.
TLDR : Answer Summary
You should apply for the year extension for your Non Immigrant O visa for marriage to a Thai citizen when you have 30 days or less remaining on your current visa stamp. However, some offices in Bangkok, Chiang Mai, and a few others may allow applications when you have 45 days or less left.