Hi I'd like to know after etting a 30 day entry visa at the airport on arrival which will take me up to 9th October how long in advance can I apply for an extension of another 30 days? Do I have to wait till the first 30 days exires or can I apply eg 28th September. What date is the visa issued from the date of application or the date the previous visa expires? Thank you
TLDR : Answer Summary
After entering Thailand with a 30-day visa exempt entry, you can apply for a 30-day extension at an immigration office as early as two weeks before your initial visa expires. This means you can apply as early as September 22 if your entry date will take you to October 9. The extension will be added to the expiry date of your original entry stamp.