The ESTA (Electronic System for Travel Authorization), once successfully approved, is valid for a span of two years unless it is revoked. This validity stands for the period from the time and date of the authorization and issue, the エスタ is void in case the passport expires within that span of time. The displayed screen for the ESTA shows the expiration date and time of the approved authorization. The validity of the Electronic System for Travel Authorization stands for multiple visits and trips all over the allocated time of two years of validity from the date of authorization or unless the passport is expired for an individual. This signifies that there is no need to apply for the ESTA again and again in the span of the two permitted years of validity for multiple visits internationally.
In case, there is an expiration for the ESTA while departure, there is no effect caused to the departure from the country. A printed copy for storing the records is mandatory for every individual holding a valid ESTA and the copy is required when one arrives at the international boundaries of the country that they have planned to visit. However, in most of the case, the information is passed over electronically to the officers. An ESTA does not permit an individual to stay in the country for a span of two years at a stretch; it only allows an individual to travel to the country for a specific reason from countries under the VWP (Visa Waiver Program) for a maximum timespan of ninety day at a maximum.
In case of prolonged stays, the individual needs to get hold of a visa from the nearest Embassy or the Consulate. In case of any changes made to the newly made documents, there is a re-verification done for authorizing the travel.