How long is ESTA Valid ?
An USA ESTA application is a electronic authorization that allows you to travel to the United States, is valid for two years from the date of issue. During these two years, you can enter the United States whenever you want. Whenever you travel to the United States, your stay cannot last more than 90 consecutive days. Also consider that ESTA can expire before the two years for various reasons. In these cases, it is not possible to request an extension or modify the expired ESTA: the only viable solution to travel to the United States will be to submit a new request online.
Let's now answer the question: How long is ESTA Valid ?