Greetings, I'm a US citizen. What are the odds of my being granted the 30 day extension if I arrive on a 60 day visa (it is apparently at the discresion of an immigration agent). For my visa application into Thailand, I wanted to purchase a roundtrip ticket to Vietnam to meet the exit ticket requirements....two possible problems wtih this: Am I allowed to come back to thailand that soon? (I understand I'm only allowed 90 days in a six month period. Thank you so much.