When going border run, to extent visa, will it then be extended proportionally to the current expiry date, or will it be extended from the date of stamp? Should one go as late as possible?
TLDR : Answer Summary
When performing a border run in Thailand, the newly granted 30-day Visa Exempt Entry begins from the date of re-entry, not extending the existing visa's expiry date. Therefore, if you are nearing your tourist visa's expiration, going on the last day is advisable, as the 30-day visa granted upon border re-entry will not add time but will start on that date. Additionally, travelers should be aware that border runs for a new Visa Exempt Entry are limited to twice per calendar year for citizens from 54 specific countries.