How long is my ESTA approval good for?
Your ESTA authorization is generally valid for multiple trips over a period of two years (starting the date that you are approved) or until your passport expires, whichever comes first*. This means that as long as you received an ESTA authorization to travel, you do not have to reapply during the validity period.
If your ESTA expires while in the US it will not affect your departure.
Note: Is it important to PRINT a copy of the document for your records. The printout is not required upon arrival into the United States, as the officers have the information electronically. Some airlines require the printout upon check-in, please check with your respective airline.
Receiving ESTA authorization does not mean you may stay in the U.S. for two years. It only allows you to travel to the U.S. under the terms of the Visa Waiver Program (VWP), which only allows you to stay in the U.S. for 90 days or less. If you plan to stay for longer than 90 days, you must obtain a visa at the nearest U.S. Embassy or Consulate.
*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. This is also required if one of your answers to any of the VWP eligibility questions changes. The associated fee of $14 will be charged for each new application submitted.
Note: While CBP recommends that you apply for ESTA at least 72 hours before travel, you may apply anytime prior to boarding. In most cases, a response is received within seconds of submitting an application.
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https://help.cbp.gov/app/answers/detail/a_id/1126/~/esta---length-of-approval