In most cases, the Electronic System for Travel Authorization will send you an e-mail with your approved authorization within 2 hours. In cases where more time is needed to process an electronic travel authorization request, the response can take up to 72 hours. If you receive a "pending" response, you will receive information to check the status of your request. The three possible responses to an electronic travel authorization request are:Authorization Approved.Your travel authorization has been approved and you are authorized to travel to the United States under the Visa Waiver Program. The system displays confirmation of the application approval and a payment receipt notice showing the amount charged to your credit card. A travel authorization does not guarantee admission to the United States as a Customs and Border Protection officer at a port of entry will have the final determination.Travel Not Authorized.You are not authorized to travel to the United States under the Visa Waiver Program. You may be able to obtain a visa from the Department of State for your travel. Please visit the United States Department of State Web site at www.travel.state.gov for additional information about applying for a visa. This response does not deny entry into the United States. This response only prohibits you from traveling to the United States under the Visa Waiver Program. The system also displays a payment receipt notice showing the amount charged to your credit card for the processing of the ESTA application.Authorization Pending.Your travel authorization is under review because an immediate determination could not be made for your application. This response does not indicate negative findings. A determination will usually be available within 72 hours. Please return to this Web site and click “Check ESTA Status”. Your application number, passport number, and birth date will be required to check the status of your application.