How far in advance can I apply for an extension to my 60 day SETV? US passport, “visiting” Chiang Mai.
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TLDR : Answer Summary
You can apply for an extension to your 60-day SETV in Chiang Mai between 45 days before your current visa expiration date and the last day stamped in your passport.
Robert *******
Between 45 days and the last day of your Admitted to Stay date stamped in your passport.