A 30-day stamp under visa exemption scheme shall expire once you exit the country. Should you re-enter by land, you will only get a 15-day stamp. Unless, if you will travel back by air, then you will be able to get another 30-day stamp in Thailand. However, since November 1, 2013, seven countries namely: USA, UK, Canada, Germany, France, Italy and Japan can re-enter Thailand by land or air and will automatically receive 30-day stamp.
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