How many days can I stay in Thailand with a visa exempt stamp and a 30-day extension?

If you enter Thailand on a visa-exempt stamp, you typically receive a 30-day allowance. If you apply for a 30-day extension before the initial 30 days are up, the extension will start on the first day after your initial stamp expires. In this case, if you arrive on January 17th and get stamped in for 44 days (counting the day of arrival), and add a 30-day extension, you'll have a total of 74 days in Thailand. Additionally, for your return flight after 75 days, while it may satisfy immigration requirements, ensure your airline does not have strict policies regarding proof of onward travel.