I am doing the same. Just extended my first 60 day last week and off to Phu Quoc for a week at the the end of this month . My flight back to the UK after I come back from phu Quoc is already booked and paid for. I will then return to Thailand to retire in December
. Absolute GARBAGE. The government are not worried about people doing 1 border run then leaving Thailand. It is the people doing it 4 times a year that they are concerned about.
. I did exactly the same . I arrived April 30th and went last week to the immigration office in Samut Prakun to get an extra 30 days added to the 60 from visa exempt entry. My extension runs out July 28th . The 30 day extension cost me 1900 Baht . When you go to immigration make sure you have a pen and a passport sized photograph
It is definitely 60 days , I entered on the same and i extended for another 30 days last Thursday at samut prakan immigration office and it took me about 90 minutes from arrival at the office to getting my passport back with the extension in it