Can I extend my 30-day visitor visa in Thailand without leaving the country, and how many times can it be extended?

You can extend a 30-day visitor visa (or visa exempt stay) in Thailand without leaving the country. It can typically be extended once for an additional 30 days. However, during the COVID-19 situation, there were provisions for further extensions, potentially allowing up to 60 days with documentation from your embassy. Always check the current regulations, as they may change.