How do I transition from an ED visa to a NON-O visa for retirement in Thailand, and how many days should I have left on my ED visa?

Transitioning from an ED visa to a NON-O visa for retirement purposes in Thailand requires careful planning. First, it's important to note that you cannot directly transfer between these visa types while in the country. Instead, you will need to change the reason for your extension based on education to one based on retirement. To start this process, make sure you have documentation from your educational institution regarding your studies' end date. It is advisable to approach immigration with ample time left on your ED visa, but there is no strict rule on how many days must remain; however, a smooth transition generally happens close to your current visa's expiration. The 15-day consideration period mentioned pertains to applications for in-country NON-immigrant type visas, which does not apply here.