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A travel authorization is valid for two years after the application date or until the passport expiration date whichever happens first.

If you obtain a new passport or change your name, gender or country of citizenship, you will be required to apply for a new travel authorization.

If your ESTA has expired, you must reapply by submitting a new application.

Your ESTA must be valid when you enter the U.S., if it expires during your stay it will not affect your departure.