A 20,000 THB fine and a 10 year ban. They took him into a separate room and asked him a lot of questions: why the overstay was so long, how he had supported himself all those years, how he had managed to renew his passport without a visa, whether he had ever undergone surgery or been hospitalized, whether he had ever been stopped by the police, how he traveled around the country, and other questions. He told me that just under two hours passed from the moment they checked his passport to the time they let him go. There were two immigration officers with him, and, according to him, neither of them seemed particularly angry about what he had done.