Hello.. If my 60 day visa is valid until 8/8 and I want to extend it for another 30 days, can I do it the last day? And if yes what are the chances for the immigration to be too busy and I don't get it the same day? (In Bangkok - immigration near Don Mueang)
TLDR : Answer Summary
Yes, you can extend your 60-day visa for an additional 30 days at the immigration office on the last day, but it is advisable to do it earlier to avoid any last-minute issues. The extension costs 1900 baht, and as long as you arrive early and obtain a queue number at the Chaengwattana Immigration office, you should be served the same day.