Can I immediately request a 30-day extension on my 60-day entry visa when I land in Bangkok?

When arriving in Bangkok, you typically cannot request a 30-day extension on your standard 60-day entry permit right away. Most comments suggest that the best practice is to apply for the extension no earlier than 45 days before your 60-day duration expires, and it's recommended to go to the local immigration office, considering that policies might vary by location. Some users have highlighted that applying too far in advance might not be accepted, while others have shared experiences of successfully applying just a day after arrival. It's advised to confirm with the local immigration office for specific rules and requirements.