Good morning, all. I'm very curious about the following situation. My friend from the UK arrived in Thailand on 16 October 2018 at Suvarnabhumi airport with a multiple-entry non-immigrant O-A. He was stamped-in until 15 October 2019. I've never heard about getting an entry stamp for 1 year. Is this correct? Thanks for reading.
TLDR : Answer Summary
A multiple-entry Non-Immigrant O-A visa indeed allows for a one-year entry stamp in Thailand. Each time the holder enters Thailand, they receive a year-long entry stamp, but they must file a 90-day report if they stay for 90 consecutive days without leaving. Additionally, to maintain visa validity, a re-entry permit is required if they wish to leave and re-enter before the visa expires.