I understand we are under a Pandemic, but under the rules that existed prior to it, can a visitor arriving from the US under the Visa Exemption rule extend his stay for more than 30 days?
TLDR : Answer Summary
Under the pre-pandemic rules, a visitor from the US entering Thailand under the Visa Exemption could extend their stay for an additional 30 days at an immigration office for a fee of 1900 baht. However, this extension could only be done once, meaning that after the initial 30-day period and one extension, the visitor would need to leave the country before re-entering.