How often can you do a 60-day visa run in Thailand, and is a border run acceptable?

The frequency of using a 60-day visa extension with an additional 30-day extension is not explicitly defined in the rules; however, the immigration control officer has discretion over your entry. It's generally accepted that you can do border runs to extend your stay instead of flying out, but repeated border crossings may lead to scrutiny regarding your intentions in Thailand, so it's advisable to maintain a genuine tourist profile.