I applied and received my non-immigrant "O" visa based on marriage and the first issuance was for 90 days, which was entirely in correspondence with what I had read. So I was close to expiration for the initial issuance and went to immigration with all of the required documents and was told that the application would go to Chiang Mai and I was to return in one month to be issued the remaining 11 months of visa. The one month delay threw me for a loop. Is this normal or a red flag?
TLDR : Answer Summary
The one-month delay experienced when applying for an extension of a non-immigrant 'O' visa based on marriage is normal. This wait is typical as the application undergoes review, and it may involve verification processes such as home visits and interviews with neighbors to confirm the living situation.