If a traveler’s passport was lost, stolen, or has expired and they have recently obtained a new one, they will be required to apply for a new ESTA travel authorization before traveling to the United States.
Applying for a new ESTA is also obligatory if the following changes have occurred since the traveler last applied for an ESTA:
An approved ESTA is valid for 2 consecutive years, or until the passport it is electronically linked to expires (whichever comes first). During the validity period of your ESTA, an international traveler can go on multiple trips to the United States, without having to re-apply for a new travel authorization. However, they may only remain in US territory for 90 days at a time.
Note that it is advisable to leave a reasonable amount of time between trips so that Customs and Border Protection (CBP) do not think that you are attempting to live in the US. There is no specific requirement for how long an individual should wait between each visit.
Note: Should an ESTA expire while the traveler is in the United States, it will not affect their departure in any way. (Click here for more information about the ESTA expiry)